diff --git a/includes/data-stores/abstract-wc-order-data-store-cpt.php b/includes/data-stores/abstract-wc-order-data-store-cpt.php
index f7221506a61..5e63c2caa6e 100644
--- a/includes/data-stores/abstract-wc-order-data-store-cpt.php
+++ b/includes/data-stores/abstract-wc-order-data-store-cpt.php
@@ -1,4 +1,10 @@
 <?php
+/**
+ * Abstract_WC_Order_Data_Store_CPT class file.
+ *
+ * @package WooCommerce/Classes
+ */
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
@@ -47,7 +53,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Method to create a new order in the database.
 	 *
-	 * @param WC_Order $order
+	 * @param WC_Order $order Order object.
 	 */
 	public function create( &$order ) {
 		$order->set_version( WC_VERSION );
@@ -84,14 +90,15 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Method to read an order from the database.
 	 *
-	 * @param WC_Data $order
+	 * @param WC_Data $order Order object.
 	 *
-	 * @throws Exception
+	 * @throws Exception If passed order is invalid.
 	 */
 	public function read( &$order ) {
 		$order->set_defaults();
+		$post_object = get_post( $order->get_id() );
 
-		if ( ! $order->get_id() || ! ( $post_object = get_post( $order->get_id() ) ) || ! in_array( $post_object->post_type, wc_get_order_types() ) ) {
+		if ( ! $order->get_id() || ! $post_object || ! in_array( $post_object->post_type, wc_get_order_types() ) ) {
 			throw new Exception( __( 'Invalid order.', 'woocommerce' ) );
 		}
 
@@ -121,7 +128,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Method to update an order in the database.
 	 *
-	 * @param WC_Order $order
+	 * @param WC_Order $order Order object.
 	 */
 	public function update( &$order ) {
 		$order->save_meta_data();
@@ -165,8 +172,10 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Method to delete an order from the database.
 	 *
-	 * @param WC_Order $order
+	 * @param WC_Order $order Order object.
 	 * @param array    $args Array of args to pass to the delete method.
+	 *
+	 * @return void
 	 */
 	public function delete( &$order, $args = array() ) {
 		$id   = $order->get_id();
@@ -201,7 +210,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Excerpt for post.
 	 *
-	 * @param  WC_order $order
+	 * @param  WC_order $order Order object.
 	 * @return string
 	 */
 	protected function get_post_excerpt( $order ) {
@@ -223,8 +232,8 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Read order data. Can be overridden by child classes to load other props.
 	 *
-	 * @param WC_Order $order
-	 * @param object   $post_object
+	 * @param WC_Order $order Order object.
+	 * @param object   $post_object Post object.
 	 * @since 3.0.0
 	 */
 	protected function read_order_data( &$order, $post_object ) {
@@ -256,7 +265,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Helper method that updates all the post meta for an order based on it's settings in the WC_Order class.
 	 *
-	 * @param $order WC_Order
+	 * @param WC_Order $order Order object.
 	 * @since 3.0.0
 	 */
 	protected function update_post_meta( &$order ) {
@@ -293,7 +302,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Clear any caches.
 	 *
-	 * @param WC_Order $order
+	 * @param WC_Order $order Order object.
 	 * @since 3.0.0
 	 */
 	protected function clear_caches( &$order ) {
@@ -305,8 +314,8 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Read order items of a specific type from the database for this order.
 	 *
-	 * @param  WC_Order $order
-	 * @param  string   $type
+	 * @param  WC_Order $order Order object.
+	 * @param  string   $type Order item type.
 	 * @return array
 	 */
 	public function read_items( $order, $type ) {
@@ -316,8 +325,9 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 		$items = wp_cache_get( 'order-items-' . $order->get_id(), 'orders' );
 
 		if ( false === $items ) {
-			$get_items_sql = $wpdb->prepare( "SELECT order_item_type, order_item_id, order_id, order_item_name FROM {$wpdb->prefix}woocommerce_order_items WHERE order_id = %d ORDER BY order_item_id;", $order->get_id() );
-			$items         = $wpdb->get_results( $get_items_sql );
+			$items = $wpdb->get_results(
+				$wpdb->prepare( "SELECT order_item_type, order_item_id, order_id, order_item_name FROM {$wpdb->prefix}woocommerce_order_items WHERE order_id = %d ORDER BY order_item_id;", $order->get_id() )
+			);
 			foreach ( $items as $item ) {
 				wp_cache_set( 'item-' . $item->order_item_id, $item, 'order-items' );
 			}
@@ -338,7 +348,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Remove all line items (products, coupons, shipping, taxes) from the order.
 	 *
-	 * @param WC_Order $order
+	 * @param WC_Order $order Order object.
 	 * @param string   $type Order item type. Default null.
 	 */
 	public function delete_items( $order, $type = null ) {
@@ -356,7 +366,7 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Get token ids for an order.
 	 *
-	 * @param WC_Order $order
+	 * @param WC_Order $order Order object.
 	 * @return array
 	 */
 	public function get_payment_token_ids( $order ) {
@@ -367,8 +377,8 @@ abstract class Abstract_WC_Order_Data_Store_CPT extends WC_Data_Store_WP impleme
 	/**
 	 * Update token ids for an order.
 	 *
-	 * @param WC_Order $order
-	 * @param array    $token_ids
+	 * @param WC_Order $order Order object.
+	 * @param array    $token_ids Payment token ids.
 	 */
 	public function update_payment_token_ids( $order, $token_ids ) {
 		update_post_meta( $order->get_id(), '_payment_tokens', $token_ids );