diff --git a/includes/abstracts/abstract-wc-data.php b/includes/abstracts/abstract-wc-data.php
index 22f362553c2..30c88e98364 100644
--- a/includes/abstracts/abstract-wc-data.php
+++ b/includes/abstracts/abstract-wc-data.php
@@ -380,25 +380,6 @@ abstract class WC_Data {
 		$this->_data = $this->_default_data;
 	}
 
-	/**
-	 * Get internal data prop (raw).
-	 * @param string ...$param Prop keys to retrieve. Supports multiple keys to get nested values.
-	 * @return mixed
-	 */
-	protected function get_prop() {
-		$args = func_get_args();
-		$prop = &$this->_data;
-
-		foreach ( $args as $arg ) {
-			if ( ! isset( $prop[ $arg ] ) ) {
-				return false;
-			}
-			$prop = &$prop[ $arg ];
-		}
-
-		return $prop;
-	}
-
 	/**
 	 * Set a collection of props in one go, collect any errors, and return the result.
 	 * @param array $props Key value pairs to set. Key is the prop and should map to a setter function name.
@@ -421,27 +402,6 @@ abstract class WC_Data {
 		return sizeof( $errors->get_error_codes() ) ? $errors : true;
 	}
 
-	/**
-	 * Set internal data prop to specified value.
-	 * @param int ...$param Prop keys followed by value to set.
-	 * @throws WC_Data_Exception
-	 */
-	protected function set_prop() {
-		if ( func_num_args() < 2 ) {
-			$this->error( 'invalid_value', __( 'set_prop() requires at least 2 parameters', 'woocommerce' ) );
-		}
-
-		$args  = func_get_args();
-		$value = array_pop( $args );
-		$prop  = &$this->_data;
-
-		foreach ( $args as $arg ) {
-			$prop = &$prop[ $arg ];
-		}
-
-		$prop = $value;
-	}
-
 	/**
 	 * When invalid data is found, throw an exception unless reading from the DB.
 	 * @param string $error_code Error code.
diff --git a/includes/abstracts/abstract-wc-order.php b/includes/abstracts/abstract-wc-order.php
index 91efbf7e305..207cc99ac82 100644
--- a/includes/abstracts/abstract-wc-order.php
+++ b/includes/abstracts/abstract-wc-order.php
@@ -370,7 +370,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return integer
 	 */
 	public function get_id() {
-		return $this->get_prop( 'id' );
+		return $this->_data['id'];
 	}
 
 	/**
@@ -379,7 +379,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return integer
 	 */
 	public function get_parent_id() {
-		return $this->get_prop( 'parent_id' );
+		return $this->_data['parent_id'];
 	}
 
 	/**
@@ -387,7 +387,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_currency() {
-		return apply_filters( 'woocommerce_get_currency', $this->get_prop( 'currency' ), $this );
+		return apply_filters( 'woocommerce_get_currency', $this->_data['currency'], $this );
 	}
 
 	/**
@@ -395,7 +395,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_version() {
-		return $this->get_prop( 'version' );
+		return $this->_data['version'];
 	}
 
 	/**
@@ -403,7 +403,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return bool
 	 */
 	public function get_prices_include_tax() {
-		return $this->get_prop( 'prices_include_tax' );
+		return $this->_data['prices_include_tax'];
 	}
 
 	/**
@@ -411,7 +411,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return int
 	 */
 	public function get_date_created() {
-		return $this->get_prop( 'date_created' );
+		return $this->_data['date_created'];
 	}
 
 	/**
@@ -419,7 +419,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return int
 	 */
 	public function get_date_modified() {
-		return $this->get_prop( 'date_modified' );
+		return $this->_data['date_modified'];
 	}
 
 	/**
@@ -427,7 +427,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_status() {
-		$status = $this->get_prop( 'status' );
+		$status = $this->_data['status'];
 		return apply_filters( 'woocommerce_order_get_status', 'wc-' === substr( $status, 0, 3 ) ? substr( $status, 3 ) : $status, $this );
 	}
 
@@ -437,7 +437,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_discount_total( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'discount_total' ) );
+		$value = wc_format_decimal( $this->_data['discount_total'] );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_discount_total', $value, $this );
 	}
 
@@ -447,7 +447,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_discount_tax( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'discount_tax' ) );
+		$value = wc_format_decimal( $this->_data['discount_tax'] );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_discount_tax', $value, $this );
 	}
 
@@ -457,7 +457,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_shipping_total( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'shipping_total' ) );
+		$value = wc_format_decimal( $this->_data['shipping_total'] );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_shipping_total', $value, $this );
 	}
 
@@ -467,7 +467,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return string
 	 */
 	public function get_shipping_tax( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'shipping_tax' ) );
+		$value = wc_format_decimal( $this->_data['shipping_tax'] );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_shipping_tax', $value, $this );
 	}
 
@@ -477,7 +477,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return float
 	 */
 	public function get_cart_tax( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'cart_tax' ) );
+		$value = wc_format_decimal( $this->_data['cart_tax'] );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_cart_tax', $value, $this );
 	}
 
@@ -487,7 +487,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return float
 	 */
 	public function get_total( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'total' ), wc_get_price_decimals() );
+		$value = wc_format_decimal( $this->_data['total'], wc_get_price_decimals() );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_total', $value, $this );
 	}
 
@@ -502,7 +502,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @return float
 	 */
 	public function get_total_tax( $raw = false ) {
-		$value = wc_format_decimal( $this->get_prop( 'total_tax' ) );
+		$value = wc_format_decimal( $this->_data['total_tax'] );
 		return $raw ? $value : apply_filters( 'woocommerce_order_amount_total_tax', $value, $this );
 	}
 
@@ -585,7 +585,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_id( $value ) {
-		$this->set_prop( 'id', absint( $value ) );
+		$this->_data['id'] = absint( $value );
 	}
 
 	/**
@@ -598,7 +598,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 		if ( $value && ! get_post( $value ) ) {
 			$this->error( 'order_invalid_parent_id', __( 'Invalid parent ID', 'woocommerce' ) );
 		}
-		$this->set_prop( 'parent_id', absint( $value ) );
+		$this->_data['parent_id'] = absint( $value );
 	}
 
 	/**
@@ -616,7 +616,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 			$new_status = 'pending';
 		}
 
-		$this->set_prop( 'status', 'wc-' . $new_status );
+		$this->_data['status'] = 'wc-' . $new_status;
 
 		// If the old status is set but unknown (e.g. draft) assume its pending for action usage.
 		if ( $old_status && ! in_array( 'wc-' . $old_status, array_keys( wc_get_order_statuses() ) ) ) {
@@ -635,7 +635,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_version( $value ) {
-		$this->set_prop( 'version', $value );
+		$this->_data['version'] = $value;
 	}
 
 	/**
@@ -647,7 +647,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 		if ( $value && ! in_array( $value, array_keys( get_woocommerce_currencies() ) ) ) {
 			$this->error( 'order_invalid_currency', __( 'Invalid currency code', 'woocommerce' ) );
 		}
-		$this->set_prop( 'currency', $value );
+		$this->_data['currency'] = $value;
 	}
 
 	/**
@@ -656,7 +656,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_prices_include_tax( $value ) {
-		$this->set_prop( 'prices_include_tax', (bool) $value );
+		$this->_data['prices_include_tax'] = (bool) $value;
 	}
 
 	/**
@@ -665,7 +665,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_date_created( $timestamp ) {
-		$this->set_prop( 'date_created', is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp ) );
+		$this->_data['date_created'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
 	}
 
 	/**
@@ -674,7 +674,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_date_modified( $timestamp ) {
-		$this->set_prop( 'date_modified', is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp ) );
+		$this->_data['date_modified'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
 	}
 
 	/**
@@ -683,7 +683,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_discount_total( $value ) {
-		$this->set_prop( 'discount_total', wc_format_decimal( $value ) );
+		$this->_data['discount_total'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -692,7 +692,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_discount_tax( $value ) {
-		$this->set_prop( 'discount_tax', wc_format_decimal( $value ) );
+		$this->_data['discount_tax'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -701,7 +701,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_total( $value ) {
-		$this->set_prop( 'shipping_total', wc_format_decimal( $value ) );
+		$this->_data['shipping_total'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -710,7 +710,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_tax( $value ) {
-		$this->set_prop( 'shipping_tax', wc_format_decimal( $value ) );
+		$this->_data['shipping_tax'] = wc_format_decimal( $value );
 		$this->set_total_tax( $this->get_cart_tax() + $this->get_shipping_tax() );
 	}
 
@@ -720,7 +720,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_cart_tax( $value ) {
-		$this->set_prop( 'cart_tax', wc_format_decimal( $value ) );
+		$this->_data['cart_tax'] = wc_format_decimal( $value );
 		$this->set_total_tax( $this->get_cart_tax() + $this->get_shipping_tax() );
 	}
 
@@ -730,7 +730,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 	 * @throws WC_Data_Exception
 	 */
 	protected function set_total_tax( $value ) {
-		$this->set_prop( 'total_tax', wc_format_decimal( $value ) );
+		$this->_data['total_tax'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -744,7 +744,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 			_deprecated_argument( 'total_type', '2.7', 'Use dedicated total setter methods instead.' );
 			return $this->legacy_set_total( $value, $deprecated );
 		}
-		$this->set_prop( 'total', wc_format_decimal( $value, wc_get_price_decimals() ) );
+		$this->_data['total'] = wc_format_decimal( $value, wc_get_price_decimals() );
 	}
 
 	/*
diff --git a/includes/class-wc-order-item-coupon.php b/includes/class-wc-order-item-coupon.php
index 9875935cb9a..204404f9ab8 100644
--- a/includes/class-wc-order-item-coupon.php
+++ b/includes/class-wc-order-item-coupon.php
@@ -127,7 +127,7 @@ class WC_Order_Item_Coupon extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_code( $value ) {
-		$this->set_prop( 'code', wc_clean( $value ) );
+		$this->_data['code'] = wc_clean( $value );
 	}
 
 	/**
@@ -136,7 +136,7 @@ class WC_Order_Item_Coupon extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_discount( $value ) {
-		$this->set_prop( 'discount', wc_format_decimal( $value ) );
+		$this->_data['discount'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -145,7 +145,7 @@ class WC_Order_Item_Coupon extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_discount_tax( $value ) {
-		$this->set_prop( 'discount_tax', wc_format_decimal( $value ) );
+		$this->_data['discount_tax'] = wc_format_decimal( $value );
 	}
 
 	/*
@@ -175,7 +175,7 @@ class WC_Order_Item_Coupon extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_code() {
-		return $this->get_prop( 'code' );
+		return $this->_data['code'];
 	}
 
 	/**
@@ -183,7 +183,7 @@ class WC_Order_Item_Coupon extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_discount() {
-		return wc_format_decimal( $this->get_prop( 'discount' ) );
+		return wc_format_decimal( $this->_data['discount'] );
 	}
 
 	/**
@@ -191,6 +191,6 @@ class WC_Order_Item_Coupon extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_discount_tax() {
-		return wc_format_decimal( $this->get_prop( 'discount_tax' ) );
+		return wc_format_decimal( $this->_data['discount_tax'] );
 	}
 }
diff --git a/includes/class-wc-order-item-fee.php b/includes/class-wc-order-item-fee.php
index 0a5e6394fc3..b071bf7067c 100644
--- a/includes/class-wc-order-item-fee.php
+++ b/includes/class-wc-order-item-fee.php
@@ -135,7 +135,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 		if ( $value && ! in_array( $value, WC_Tax::get_tax_classes() ) ) {
 			$this->error( 'order_item_fee_invalid_tax_class', __( 'Invalid tax class', 'woocommerce' ) );
 		}
-		$this->set_prop( 'tax_class', $value );
+		$this->_data['tax_class'] = $value;
 	}
 
 	/**
@@ -145,9 +145,9 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 */
 	public function set_tax_status( $value ) {
 		if ( in_array( $value, array( 'taxable', 'none' ) ) ) {
-			$this->set_prop( 'tax_status', $value );
+			$this->_data['tax_status'] = $value;
 		} else {
-			$this->set_prop( 'tax_status', 'taxable' );
+			$this->_data['tax_status'] = 'taxable';
 		}
 	}
 
@@ -157,7 +157,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_total( $value ) {
-		$this->set_prop( 'total', wc_format_decimal( $value ) );
+		$this->_data['total'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -166,7 +166,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	protected function set_total_tax( $value ) {
-		$this->set_prop( 'total_tax', wc_format_decimal( $value ) );
+		$this->_data['total_tax'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -184,7 +184,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 		if ( ! empty( $raw_tax_data['total'] ) ) {
 			$tax_data['total'] = array_map( 'wc_format_decimal', $raw_tax_data['total'] );
 		}
-		$this->set_prop( 'taxes', $tax_data );
+		$this->_data['taxes'] = $tax_data;
 		$this->set_total_tax( array_sum( $tax_data['total'] ) );
 	}
 
@@ -199,7 +199,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_name() {
-		return $this->get_prop( 'name' ) ? $this->get_prop( 'name' ) : __( 'Fee', 'woocommerce' );
+		return $this->_data['name'] ? $this->_data['name'] : __( 'Fee', 'woocommerce' );
 	}
 
 	/**
@@ -215,7 +215,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_tax_class() {
-		return $this->get_prop( 'tax_class' );
+		return $this->_data['tax_class'];
 	}
 
 	/**
@@ -223,7 +223,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_tax_status() {
-		return $this->get_prop( 'tax_status' );
+		return $this->_data['tax_status'];
 	}
 
 	/**
@@ -231,7 +231,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_total() {
-		return wc_format_decimal( $this->get_prop( 'total' ) );
+		return wc_format_decimal( $this->_data['total'] );
 	}
 
 	/**
@@ -239,7 +239,7 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_total_tax() {
-		return wc_format_decimal( $this->get_prop( 'total_tax' ) );
+		return wc_format_decimal( $this->_data['total_tax'] );
 	}
 
 	/**
@@ -247,6 +247,6 @@ class WC_Order_Item_Fee extends WC_Order_Item {
 	 * @return array
 	 */
 	public function get_taxes() {
-		return $this->get_prop( 'taxes' );
+		return $this->_data['taxes'];
 	}
 }
diff --git a/includes/class-wc-order-item-product.php b/includes/class-wc-order-item-product.php
index 23c1f0d7b07..5f77e463906 100644
--- a/includes/class-wc-order-item-product.php
+++ b/includes/class-wc-order-item-product.php
@@ -240,7 +240,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 		if ( 0 >= $value ) {
 			$this->error( 'order_item_product_invalid_quantity', __( 'Quantity must be positive', 'woocommerce' ) );
 		}
-		$this->set_prop( 'quantity', wc_stock_amount( $value ) );
+		$this->_data['quantity'] = wc_stock_amount( $value );
 	}
 
 	/**
@@ -252,7 +252,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 		if ( $value && ! in_array( $value, WC_Tax::get_tax_classes() ) ) {
 			$this->error( 'order_item_product_invalid_tax_class', __( 'Invalid tax class', 'woocommerce' ) );
 		}
-		$this->set_prop( 'tax_class', $value );
+		$this->_data['tax_class'] = $value;
 	}
 
 	/**
@@ -264,7 +264,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 		if ( $value > 0 && 'product' !== get_post_type( absint( $value ) ) ) {
 			$this->error( 'order_item_product_invalid_product_id', __( 'Invalid product ID', 'woocommerce' ) );
 		}
-		$this->set_prop( 'product_id', absint( $value ) );
+		$this->_data['product_id'] = absint( $value );
 	}
 
 	/**
@@ -276,7 +276,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 		if ( $value > 0 && 'product_variation' !== get_post_type( $value ) ) {
 			$this->error( 'order_item_product_invalid_variation_id', __( 'Invalid variation ID', 'woocommerce' ) );
 		}
-		$this->set_prop( 'variation_id', absint( $value ) );
+		$this->_data['variation_id'] = absint( $value );
 	}
 
 	/**
@@ -285,7 +285,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_subtotal( $value ) {
-		$this->set_prop( 'subtotal', wc_format_decimal( $value ) );
+		$this->_data['subtotal'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -294,7 +294,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_total( $value ) {
-		$this->set_prop( 'total', wc_format_decimal( $value ) );
+		$this->_data['total'] = wc_format_decimal( $value );
 
 		// Subtotal cannot be less than total
 		if ( ! $this->get_subtotal() || $this->get_subtotal() < $this->get_total() ) {
@@ -308,7 +308,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	protected function set_subtotal_tax( $value ) {
-		$this->set_prop( 'subtotal_tax', wc_format_decimal( $value ) );
+		$this->_data['subtotal_tax'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -317,7 +317,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	protected function set_total_tax( $value ) {
-		$this->set_prop( 'total_tax', wc_format_decimal( $value ) );
+		$this->_data['total_tax'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -340,7 +340,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 				$tax_data['subtotal'] = $tax_data['total'];
 			}
 		}
-		$this->set_prop( 'taxes', $tax_data );
+		$this->_data['taxes'] = $tax_data;
 		$this->set_total_tax( array_sum( $tax_data['total'] ) );
 		$this->set_subtotal_tax( array_sum( $tax_data['subtotal'] ) );
 	}
@@ -390,7 +390,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return int
 	 */
 	public function get_product_id() {
-		return absint( $this->get_prop( 'product_id' ) );
+		return absint( $this->_data['product_id'] );
 	}
 
 	/**
@@ -398,7 +398,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return int
 	 */
 	public function get_variation_id() {
-		return absint( $this->get_prop( 'variation_id' ) );
+		return absint( $this->_data['variation_id'] );
 	}
 
 	/**
@@ -406,7 +406,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return int
 	 */
 	public function get_quantity() {
-		return wc_stock_amount( $this->get_prop( 'quantity' ) );
+		return wc_stock_amount( $this->_data['quantity'] );
 	}
 
 	/**
@@ -414,7 +414,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_tax_class() {
-		return $this->get_prop( 'tax_class' );
+		return $this->_data['tax_class'];
 	}
 
 	/**
@@ -422,7 +422,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_subtotal() {
-		return wc_format_decimal( $this->get_prop( 'subtotal' ) );
+		return wc_format_decimal( $this->_data['subtotal'] );
 	}
 
 	/**
@@ -430,7 +430,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_subtotal_tax() {
-		return wc_format_decimal( $this->get_prop( 'subtotal_tax' ) );
+		return wc_format_decimal( $this->_data['subtotal_tax'] );
 	}
 
 	/**
@@ -438,7 +438,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_total() {
-		return wc_format_decimal( $this->get_prop( 'total' ) );
+		return wc_format_decimal( $this->_data['total'] );
 	}
 
 	/**
@@ -446,7 +446,7 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_total_tax() {
-		return wc_format_decimal( $this->get_prop( 'total_tax' ) );
+		return wc_format_decimal( $this->_data['total_tax'] );
 	}
 
 	/**
@@ -454,6 +454,6 @@ class WC_Order_Item_Product extends WC_Order_Item {
 	 * @return array
 	 */
 	public function get_taxes() {
-		return $this->get_prop( 'taxes' );
+		return $this->_data['taxes'];
 	}
 }
diff --git a/includes/class-wc-order-item-shipping.php b/includes/class-wc-order-item-shipping.php
index f779cd4803a..6e09ffc325b 100644
--- a/includes/class-wc-order-item-shipping.php
+++ b/includes/class-wc-order-item-shipping.php
@@ -130,7 +130,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_method_title( $value ) {
-		$this->set_prop( 'method_title', wc_clean( $value ) );
+		$this->_data['method_title'] = wc_clean( $value );
 	}
 
 	/**
@@ -139,7 +139,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_method_id( $value ) {
-		$this->set_prop( 'method_id', wc_clean( $value ) );
+		$this->_data['method_id'] = wc_clean( $value );
 	}
 
 	/**
@@ -148,7 +148,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_total( $value ) {
-		$this->set_prop( 'total', wc_format_decimal( $value ) );
+		$this->_data['total'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -157,7 +157,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	protected function set_total_tax( $value ) {
-		$this->set_prop( 'total_tax', wc_format_decimal( $value ) );
+		$this->_data['total_tax'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -175,7 +175,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 		if ( ! empty( $raw_tax_data['total'] ) ) {
 			$tax_data['total']    = array_map( 'wc_format_decimal', $raw_tax_data['total'] );
 		}
-		$this->set_prop( 'taxes', $tax_data );
+		$this->_data['taxes'] = $tax_data;
 		$this->set_total_tax( array_sum( $tax_data['total'] ) );
 	}
 
@@ -219,7 +219,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_method_title() {
-		return $this->get_prop( 'method_title' ) ? $this->get_prop( 'method_title' ) : __( 'Shipping', 'woocommerce' );
+		return $this->_data['method_title'] ? $this->_data['method_title'] : __( 'Shipping', 'woocommerce' );
 	}
 
 	/**
@@ -227,7 +227,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_method_id() {
-		return $this->get_prop( 'method_id' );
+		return $this->_data['method_id'];
 	}
 
 	/**
@@ -235,7 +235,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_total() {
-		return wc_format_decimal( $this->get_prop( 'total' ) );
+		return wc_format_decimal( $this->_data['total'] );
 	}
 
 	/**
@@ -243,7 +243,7 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_total_tax() {
-		return wc_format_decimal( $this->get_prop( 'total_tax' ) );
+		return wc_format_decimal( $this->_data['total_tax'] );
 	}
 
 	/**
@@ -251,6 +251,6 @@ class WC_Order_Item_Shipping extends WC_Order_Item {
 	 * @return array
 	 */
 	public function get_taxes() {
-		return $this->get_prop( 'taxes' );
+		return $this->_data['taxes'];
 	}
 }
diff --git a/includes/class-wc-order-item-tax.php b/includes/class-wc-order-item-tax.php
index f695ea6ad31..4b77167bc9c 100644
--- a/includes/class-wc-order-item-tax.php
+++ b/includes/class-wc-order-item-tax.php
@@ -102,7 +102,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_rate_code( $value ) {
-		$this->set_prop( 'rate_code', wc_clean( $value ) );
+		$this->_data['rate_code'] = wc_clean( $value );
 	}
 
 	/**
@@ -111,7 +111,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_label( $value ) {
-		$this->set_prop( 'label', wc_clean( $value ) );
+		$this->_data['label'] = wc_clean( $value );
 	}
 
 	/**
@@ -120,7 +120,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_rate_id( $value ) {
-		$this->set_prop( 'rate_id', absint( $value ) );
+		$this->_data['rate_id'] = absint( $value );
 	}
 
 	/**
@@ -129,7 +129,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_tax_total( $value ) {
-		$this->set_prop( 'tax_total', wc_format_decimal( $value ) );
+		$this->_data['tax_total'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -138,7 +138,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_tax_total( $value ) {
-		$this->set_prop( 'shipping_tax_total', wc_format_decimal( $value ) );
+		$this->_data['shipping_tax_total'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -147,7 +147,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_compound( $value ) {
-		$this->set_prop( 'compound', (bool) $value );
+		$this->_data['compound'] = (bool) $value;
 	}
 
 	/**
@@ -189,7 +189,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_rate_code() {
-		return $this->get_prop( 'rate_code' );
+		return $this->_data['rate_code'];
 	}
 
 	/**
@@ -197,7 +197,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_label() {
-		return $this->get_prop( 'label' ) ? $this->get_prop( 'label' ) : __( 'Tax', 'woocommerce' );
+		return $this->_data['label'] ? $this->_data['label'] : __( 'Tax', 'woocommerce');
 	}
 
 	/**
@@ -205,7 +205,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @return int
 	 */
 	public function get_rate_id() {
-		return absint( $this->get_prop( 'rate_id' ) );
+		return absint( $this->_data['rate_id'] );
 	}
 
 	/**
@@ -213,7 +213,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_tax_total() {
-		return wc_format_decimal( $this->get_prop( 'tax_total' ) );
+		return wc_format_decimal( $this->_data['tax_total'] );
 	}
 
 	/**
@@ -221,7 +221,7 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @return string
 	 */
 	public function get_shipping_tax_total() {
-		return wc_format_decimal( $this->get_prop( 'shipping_tax_total' ) );
+		return wc_format_decimal( $this->_data['shipping_tax_total'] );
 	}
 
 	/**
@@ -229,6 +229,6 @@ class WC_Order_Item_Tax extends WC_Order_Item {
 	 * @return bool
 	 */
 	public function get_compound() {
-		return (bool) $this->get_prop( 'compound' );
+		return (bool) $this->_data['compound'];
 	}
 }
diff --git a/includes/class-wc-order-item.php b/includes/class-wc-order-item.php
index ebc27b44343..95d26bf553e 100644
--- a/includes/class-wc-order-item.php
+++ b/includes/class-wc-order-item.php
@@ -105,7 +105,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @return int
 	 */
 	public function get_id() {
-		return $this->get_prop( 'id' );
+		return $this->_data['id'];
 	}
 
 	/**
@@ -113,7 +113,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @return int
 	 */
 	public function get_order_id() {
-		return $this->get_prop( 'order_id' );
+		return $this->_data['order_id'];
 	}
 
 	/**
@@ -121,7 +121,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @return string
 	 */
 	public function get_name() {
-		return $this->get_prop( 'name' );
+		return $this->_data['name'];
 	}
 
 	/**
@@ -129,7 +129,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @return string
 	 */
 	public function get_type() {
-		return $this->get_prop( 'type' );
+		return $this->_data['type'];
 	}
 
 	/*
@@ -144,7 +144,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_id( $value ) {
-		$this->set_prop( 'id', absint( $value ) );
+		$this->_data['id'] = absint( $value );
 	}
 
 	/**
@@ -153,7 +153,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_order_id( $value ) {
-		$this->set_prop( 'order_id', absint( $value ) );
+		$this->_data['order_id'] = absint( $value );
 	}
 
 	/**
@@ -162,7 +162,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_name( $value ) {
-		$this->set_prop( 'name', wc_clean( $value ) );
+		$this->_data['name'] = wc_clean( $value );
 	}
 
 	/**
@@ -171,7 +171,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 	 * @throws WC_Data_Exception
 	 */
 	protected function set_type( $value ) {
-		$this->set_prop( 'type', wc_clean( $value ) );
+		$this->_data['type'] = wc_clean( $value );
 	}
 
 	/*
diff --git a/includes/class-wc-order-refund.php b/includes/class-wc-order-refund.php
index 8d4d62dce36..16b7942910b 100644
--- a/includes/class-wc-order-refund.php
+++ b/includes/class-wc-order-refund.php
@@ -118,7 +118,7 @@ class WC_Order_Refund extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_amount( $value ) {
-		$this->set_prop( 'amount', wc_format_decimal( $value ) );
+		$this->_data['amount'] = wc_format_decimal( $value );
 	}
 
 	/**
@@ -126,7 +126,7 @@ class WC_Order_Refund extends WC_Abstract_Order {
 	 * @return int|float
 	 */
 	public function get_amount() {
-		return apply_filters( 'woocommerce_refund_amount', (double) $this->get_prop( 'amount' ), $this );
+		return apply_filters( 'woocommerce_refund_amount', (double) $this->_data['amount'], $this );
 	}
 
 	/**
@@ -144,7 +144,7 @@ class WC_Order_Refund extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_reason( $value ) {
-		$this->set_prop( 'reason', $value );
+		$this->_data['reason'] = $value;
 	}
 
 	/**
@@ -153,7 +153,7 @@ class WC_Order_Refund extends WC_Abstract_Order {
 	 * @return int|float
 	 */
 	public function get_reason() {
-		return apply_filters( 'woocommerce_refund_reason', $this->get_prop( 'reason' ), $this );
+		return apply_filters( 'woocommerce_refund_reason', $this->_data['reason'], $this );
 	}
 
 	/**
@@ -162,7 +162,7 @@ class WC_Order_Refund extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_refunded_by( $value ) {
-		$this->set_prop( 'refunded_by', absint( $value ) );
+		$this->_data['refunded_by'] = absint( $value );
 	}
 
 	/**
@@ -171,7 +171,7 @@ class WC_Order_Refund extends WC_Abstract_Order {
 	 * @return int
 	 */
 	public function get_refunded_by() {
-		return absint( $this->get_prop( 'refunded_by' ) );
+		return absint( $this->_data['refunded_by'] );
 	}
 
 	/**
diff --git a/includes/class-wc-order.php b/includes/class-wc-order.php
index f60530140b4..66ed17608ff 100644
--- a/includes/class-wc-order.php
+++ b/includes/class-wc-order.php
@@ -500,7 +500,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_order_key() {
-		return $this->get_prop( 'order_key' );
+		return $this->_data['order_key'];
 	}
 
 	/**
@@ -508,7 +508,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return int
 	 */
 	public function get_customer_id() {
-		return $this->get_prop( 'customer_id' );
+		return $this->_data['customer_id'];
 	}
 
 	/**
@@ -532,7 +532,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_first_name() {
-		return $this->get_prop( 'billing', 'first_name' );
+		return $this->_data['billing']['first_name'];
 	}
 
 	/**
@@ -540,7 +540,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_last_name() {
-		return $this->get_prop( 'billing', 'last_name' );
+		return $this->_data['billing']['last_name'];
 	}
 
 	/**
@@ -548,7 +548,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_company() {
-		return $this->get_prop( 'billing', 'company' );
+		return $this->_data['billing']['company'];
 	}
 
 	/**
@@ -556,7 +556,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_address_1() {
-		return $this->get_prop( 'billing', 'address_1' );
+		return $this->_data['billing']['address_1'];
 	}
 
 	/**
@@ -564,7 +564,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string $value
 	 */
 	public function get_billing_address_2() {
-		return $this->get_prop( 'billing', 'address_2' );
+		return $this->_data['billing']['address_2'];
 	}
 
 	/**
@@ -572,7 +572,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string $value
 	 */
 	public function get_billing_city() {
-		return $this->get_prop( 'billing', 'city' );
+		return $this->_data['billing']['city'];
 	}
 
 	/**
@@ -580,7 +580,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_state() {
-		return $this->get_prop( 'billing', 'state' );
+		return $this->_data['billing']['state'];
 	}
 
 	/**
@@ -588,7 +588,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_postcode() {
-		return $this->get_prop( 'billing', 'postcode' );
+		return $this->_data['billing']['postcode'];
 	}
 
 	/**
@@ -596,7 +596,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_country() {
-		return $this->get_prop( 'billing', 'country' );
+		return $this->_data['billing']['country'];
 	}
 
 	/**
@@ -604,7 +604,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_email() {
-		return $this->get_prop( 'billing', 'email' );
+		return $this->_data['billing']['email'];
 	}
 
 	/**
@@ -612,7 +612,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_billing_phone() {
-		return $this->get_prop( 'billing', 'phone' );
+		return $this->_data['billing']['phone'];
 	}
 
 	/**
@@ -620,7 +620,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_first_name() {
-		return $this->get_prop( 'shipping', 'first_name' );
+		return $this->_data['shipping']['first_name'];
 	}
 
 	/**
@@ -628,7 +628,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_last_name() {
-		 return $this->get_prop( 'shipping', 'last_name' );
+		 return $this->_data['shipping']['last_name'];
 	}
 
 	/**
@@ -636,7 +636,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_company() {
-		return $this->get_prop( 'shipping', 'company' );
+		return $this->_data['shipping']['company'];
 	}
 
 	/**
@@ -644,7 +644,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_address_1() {
-		return $this->get_prop( 'shipping', 'address_1' );
+		return $this->_data['shipping']['address_1'];
 	}
 
 	/**
@@ -652,7 +652,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_address_2() {
-		return $this->get_prop( 'shipping', 'address_2' );
+		return $this->_data['shipping']['address_2'];
 	}
 
 	/**
@@ -660,7 +660,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_city() {
-		return $this->get_prop( 'shipping', 'city' );
+		return $this->_data['shipping']['city'];
 	}
 
 	/**
@@ -668,7 +668,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_state() {
-		return $this->get_prop( 'shipping', 'state' );
+		return $this->_data['shipping']['state'];
 	}
 
 	/**
@@ -676,7 +676,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_postcode() {
-		return $this->get_prop( 'shipping', 'postcode' );
+		return $this->_data['shipping']['postcode'];
 	}
 
 	/**
@@ -684,7 +684,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_shipping_country() {
-		return $this->get_prop( 'shipping', 'country' );
+		return $this->_data['shipping']['country'];
 	}
 
 	/**
@@ -692,7 +692,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_payment_method() {
-		return $this->get_prop( 'payment_method' );
+		return $this->_data['payment_method'];
 	}
 
 	/**
@@ -700,7 +700,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_payment_method_title() {
-		return $this->get_prop( 'payment_method_title' );
+		return $this->_data['payment_method_title'];
 	}
 
 	/**
@@ -708,7 +708,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_transaction_id() {
-		return $this->get_prop( 'transaction_id' );
+		return $this->_data['transaction_id'];
 	}
 
 	/**
@@ -716,7 +716,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_customer_ip_address() {
-		return $this->get_prop( 'customer_ip_address' );
+		return $this->_data['customer_ip_address'];
 	}
 
 	/**
@@ -724,7 +724,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_customer_user_agent() {
-		return $this->get_prop( 'customer_user_agent' );
+		return $this->_data['customer_user_agent'];
 	}
 
 	/**
@@ -732,7 +732,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_created_via() {
-		return $this->get_prop( 'created_via' );
+		return $this->_data['created_via'];
 	}
 
 	/**
@@ -740,7 +740,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_customer_note() {
-		return $this->get_prop( 'customer_note' );
+		return $this->_data['customer_note'];
 	}
 
 	/**
@@ -748,7 +748,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return int
 	 */
 	public function get_date_completed() {
-		return absint( $this->get_prop( 'date_completed' ) );
+		return absint( $this->_data['date_completed'] );
 	}
 
 	/**
@@ -756,7 +756,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return int
 	 */
 	public function get_date_paid() {
-		return absint( $this->get_prop( 'date_paid' ) );
+		return absint( $this->_data['date_paid'] );
 	}
 
 	/**
@@ -820,7 +820,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @return string
 	 */
 	public function get_cart_hash() {
-		return $this->get_prop( 'cart_hash' );
+		return $this->_data['cart_hash'];
 	}
 
 	/*
@@ -841,7 +841,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_order_key( $value ) {
-		$this->set_prop( 'order_key', substr( $value, 0, 20 ) );
+		$this->_data['order_key'] = substr( $value, 0, 20 );
 	}
 
 	/**
@@ -850,7 +850,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_customer_id( $value ) {
-		$this->set_prop( 'customer_id', absint( $value ) );
+		$this->_data['customer_id'] = absint( $value );
 	}
 
 	/**
@@ -859,7 +859,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_first_name( $value ) {
-		$this->set_prop( 'billing', 'first_name', $value );
+		$this->_data['billing']['first_name'] = $value;
 	}
 
 	/**
@@ -868,7 +868,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_last_name( $value ) {
-		$this->set_prop( 'billing', 'last_name', $value );
+		$this->_data['billing']['last_name'] = $value;
 	}
 
 	/**
@@ -877,7 +877,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_company( $value ) {
-		$this->set_prop( 'billing', 'company', $value );
+		$this->_data['billing']['company'] = $value;
 	}
 
 	/**
@@ -886,7 +886,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_address_1( $value ) {
-		$this->set_prop( 'billing', 'address_1', $value );
+		$this->_data['billing']['address_1'] = $value;
 	}
 
 	/**
@@ -895,7 +895,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_address_2( $value ) {
-		$this->set_prop( 'billing', 'address_2', $value );
+		$this->_data['billing']['address_2'] = $value;
 	}
 
 	/**
@@ -904,7 +904,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_city( $value ) {
-		$this->set_prop( 'billing', 'city', $value );
+		$this->_data['billing']['city'] = $value;
 	}
 
 	/**
@@ -913,7 +913,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_state( $value ) {
-		$this->set_prop( 'billing', 'state', $value );
+		$this->_data['billing']['state'] = $value;
 	}
 
 	/**
@@ -922,7 +922,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_postcode( $value ) {
-		$this->set_prop( 'billing', 'postcode', $value );
+		$this->_data['billing']['postcode'] = $value;
 	}
 
 	/**
@@ -931,7 +931,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_country( $value ) {
-		$this->set_prop( 'billing', 'country', $value );
+		$this->_data['billing']['country'] = $value;
 	}
 
 	/**
@@ -956,7 +956,7 @@ class WC_Order extends WC_Abstract_Order {
 		if ( $value && ! is_email( $value ) ) {
 			$this->error( 'order_invalid_billing_email', __( 'Invalid order billing email address', 'woocommerce' ) );
 		}
-		$this->set_prop( 'billing', 'email', sanitize_email( $value ) );
+		$this->_data['billing']['email'] = sanitize_email( $value );
 	}
 
 	/**
@@ -965,7 +965,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_billing_phone( $value ) {
-		$this->set_prop( 'billing', 'phone', $value );
+		$this->_data['billing']['phone'] = $value;
 	}
 
 	/**
@@ -974,7 +974,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_first_name( $value ) {
-		$this->set_prop( 'shipping', 'first_name', $value );
+		$this->_data['shipping']['first_name'] = $value;
 	}
 
 	/**
@@ -983,7 +983,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_last_name( $value ) {
-		$this->set_prop( 'shipping', 'last_name', $value );
+		$this->_data['shipping']['last_name'] = $value;
 	}
 
 	/**
@@ -992,7 +992,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_company( $value ) {
-		$this->set_prop( 'shipping', 'company', $value );
+		$this->_data['shipping']['company'] = $value;
 	}
 
 	/**
@@ -1001,7 +1001,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_address_1( $value ) {
-		$this->set_prop( 'shipping', 'address_1', $value );
+		$this->_data['shipping']['address_1'] = $value;
 	}
 
 	/**
@@ -1010,7 +1010,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_address_2( $value ) {
-		$this->set_prop( 'shipping', 'address_2', $value );
+		$this->_data['shipping']['address_2'] = $value;
 	}
 
 	/**
@@ -1019,7 +1019,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_city( $value ) {
-		$this->set_prop( 'shipping', 'city', $value );
+		$this->_data['shipping']['city'] = $value;
 	}
 
 	/**
@@ -1028,7 +1028,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_state( $value ) {
-		$this->set_prop( 'shipping', 'state', $value );
+		$this->_data['shipping']['state'] = $value;
 	}
 
 	/**
@@ -1037,7 +1037,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_postcode( $value ) {
-		$this->set_prop( 'shipping', 'postcode', $value );
+		$this->_data['shipping']['postcode'] = $value;
 	}
 
 	/**
@@ -1046,7 +1046,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_shipping_country( $value ) {
-		$this->set_prop( 'shipping', 'country', $value );
+		$this->_data['shipping']['country'] = $value;
 	}
 
 	/**
@@ -1059,10 +1059,10 @@ class WC_Order extends WC_Abstract_Order {
 			$this->set_payment_method( $payment_method->id );
 			$this->set_payment_method_title( $payment_method->get_title() );
 		} elseif ( '' === $payment_method ) {
-			$this->set_prop( 'payment_method', '' );
-			$this->set_prop( 'payment_method_title', '' );
+			$this->_data['payment_method'] = '';
+			$this->_data['payment_method_title'] = '';
 		} else {
-			$this->set_prop( 'payment_method', $payment_method );
+			$this->_data['payment_method'] = $payment_method;
 		}
 	}
 
@@ -1072,7 +1072,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_payment_method_title( $value ) {
-		$this->set_prop( 'payment_method_title', $value );
+		$this->_data['payment_method_title'] = $value;
 	}
 
 	/**
@@ -1081,7 +1081,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_transaction_id( $value ) {
-		$this->set_prop( 'transaction_id', $value );
+		$this->_data['transaction_id'] = $value;
 	}
 
 	/**
@@ -1090,7 +1090,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_customer_ip_address( $value ) {
-		$this->set_prop( 'customer_ip_address', $value );
+		$this->_data['customer_ip_address'] = $value;
 	}
 
 	/**
@@ -1099,7 +1099,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_customer_user_agent( $value ) {
-		$this->set_prop( 'customer_user_agent', $value );
+		$this->_data['customer_user_agent'] = $value;
 	}
 
 	/**
@@ -1108,7 +1108,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_created_via( $value ) {
-		$this->set_prop( 'created_via', $value );
+		$this->_data['created_via'] = $value;
 	}
 
 	/**
@@ -1117,7 +1117,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_customer_note( $value ) {
-		$this->set_prop( 'customer_note', $value );
+		$this->_data['customer_note'] = $value;
 	}
 
 	/**
@@ -1126,7 +1126,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_date_completed( $timestamp ) {
-		$this->set_prop( 'date_completed', is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp ) );
+		$this->_data['date_completed'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
 	}
 
 	/**
@@ -1135,7 +1135,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_date_paid( $timestamp ) {
-		$this->set_prop( 'date_paid', is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp ) );
+		$this->_data['date_paid'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
 	}
 
 	/**
@@ -1144,7 +1144,7 @@ class WC_Order extends WC_Abstract_Order {
 	 * @throws WC_Data_Exception
 	 */
 	public function set_cart_hash( $value ) {
-		$this->set_prop( 'cart_hash', $value );
+		$this->_data['cart_hash'] = $value;
 	}
 
 	/*
diff --git a/tests/framework/class-wc-mock-wc-data.php b/tests/framework/class-wc-mock-wc-data.php
index 216576057fc..16ad2d54ec2 100644
--- a/tests/framework/class-wc-mock-wc-data.php
+++ b/tests/framework/class-wc-mock-wc-data.php
@@ -76,7 +76,7 @@ class WC_Mock_WC_Data extends WC_Data {
 	 * @return string
 	 */
 	public function get_content() {
-		return $this->get_prop( 'content' );
+		return $this->_data['content'];
 	}
 
 	/**
@@ -84,7 +84,7 @@ class WC_Mock_WC_Data extends WC_Data {
 	 * @param string $content
 	 */
 	public function set_content( $content ) {
-		$this->set_prop( 'content', $content );
+		$this->_data['content'] = $content;
 	}
 
 	/**
@@ -92,7 +92,7 @@ class WC_Mock_WC_Data extends WC_Data {
 	 * @return bool
 	 */
 	public function get_bool_value() {
-		return $this->get_prop( 'bool_value' );
+		return $this->_data['bool_value'];
 	}
 
 	/**
@@ -103,7 +103,7 @@ class WC_Mock_WC_Data extends WC_Data {
 		if ( ! is_bool( $value ) ) {
 			$this->error( 'invalid_bool_value', 'O noes' );
 		}
-		$this->set_prop( 'bool_value', $value );
+		$this->_data['bool_value'] = $value;
 	}
 
 	/**