diff --git a/includes/abstracts/abstract-wc-order.php b/includes/abstracts/abstract-wc-order.php
index db68ab9462e..b9b1ae3baec 100644
--- a/includes/abstracts/abstract-wc-order.php
+++ b/includes/abstracts/abstract-wc-order.php
@@ -1475,22 +1475,6 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 			}
 		}
 
-		if ( $this->get_total() > 0 && $this->get_payment_method_title() ) {
-			$total_rows['payment_method'] = array(
-				'label' => __( 'Payment method:', 'woocommerce' ),
-				'value' => $this->get_payment_method_title(),
-			);
-		}
-
-		if ( $refunds = $this->get_refunds() ) {
-			foreach ( $refunds as $id => $refund ) {
-				$total_rows[ 'refund_' . $id ] = array(
-					'label' => $refund->get_reason() ? $refund->get_reason() : __( 'Refund', 'woocommerce' ) . ':',
-					'value'    => wc_price( '-' . $refund->get_amount(), array( 'currency' => $this->get_currency() ) ),
-				);
-			}
-		}
-
 		$total_rows['order_total'] = array(
 			'label' => __( 'Total:', 'woocommerce' ),
 			'value'    => $this->get_formatted_order_total( $tax_display ),
diff --git a/includes/class-wc-emails.php b/includes/class-wc-emails.php
index 16c3ffdf0a7..2a41d27ae48 100644
--- a/includes/class-wc-emails.php
+++ b/includes/class-wc-emails.php
@@ -366,12 +366,15 @@ class WC_Emails {
 	/**
 	 * Add customer details to email templates.
 	 *
-	 * @param mixed $order
+	 * @param WC_Order $order
 	 * @param bool $sent_to_admin (default: false)
 	 * @param bool $plain_text (default: false)
 	 * @return string
 	 */
 	public function customer_details( $order, $sent_to_admin = false, $plain_text = false ) {
+		if ( ! is_a( 'WC_Order', $order ) ) {
+			return;
+		}
 		$fields = array();
 
 		if ( $order->get_customer_note() ) {
@@ -386,14 +389,14 @@ class WC_Emails {
 				'label' => __( 'Email address', 'woocommerce' ),
 				'value' => wptexturize( $order->get_billing_email() ),
 			);
-	    }
+		}
 
-	    if ( $order->get_billing_phone() ) {
+		if ( $order->get_billing_phone() ) {
 			$fields['billing_phone'] = array(
 				'label' => __( 'Phone', 'woocommerce' ),
 				'value' => wptexturize( $order->get_billing_phone() ),
 			);
-	    }
+		}
 
 		$fields = array_filter( apply_filters( 'woocommerce_email_customer_details_fields', $fields, $sent_to_admin, $order ), array( $this, 'customer_detail_field_is_valid' ) );
 
@@ -408,6 +411,9 @@ class WC_Emails {
 	 * Get the email addresses.
 	 */
 	public function email_addresses( $order, $sent_to_admin = false, $plain_text = false ) {
+		if ( ! is_a( 'WC_Order', $order ) ) {
+			return;
+		}
 		if ( $plain_text ) {
 			wc_get_template( 'emails/plain/email-addresses.php', array( 'order' => $order ) );
 		} else {
diff --git a/includes/class-wc-order.php b/includes/class-wc-order.php
index e9678490044..2811ec44884 100644
--- a/includes/class-wc-order.php
+++ b/includes/class-wc-order.php
@@ -1685,4 +1685,35 @@ class WC_Order extends WC_Abstract_Order {
 	public function get_remaining_refund_items() {
 		return absint( $this->get_item_count() - $this->get_item_count_refunded() );
 	}
+
+	/**
+	 * Get totals for display on pages and in emails.
+	 *
+	 * @param mixed $tax_display
+	 * @return array
+	 */
+	public function get_order_item_totals( $tax_display = '' ) {
+		$total_rows = parent::get_order_item_totals( $tax_display );
+		$total_row  = array_pop( $total_rows );
+
+		if ( $this->get_total() > 0 && $this->get_payment_method_title() ) {
+			$total_rows['payment_method'] = array(
+				'label' => __( 'Payment method:', 'woocommerce' ),
+				'value' => $this->get_payment_method_title(),
+			);
+		}
+
+		if ( $refunds = $this->get_refunds() ) {
+			foreach ( $refunds as $id => $refund ) {
+				$total_rows[ 'refund_' . $id ] = array(
+					'label' => $refund->get_reason() ? $refund->get_reason() : __( 'Refund', 'woocommerce' ) . ':',
+					'value'    => wc_price( '-' . $refund->get_amount(), array( 'currency' => $this->get_currency() ) ),
+				);
+			}
+		}
+
+		$total_rows['order_total'] = $total_row;
+
+		return apply_filters( 'woocommerce_get_order_item_totals', $total_rows, $this );
+	}
 }
diff --git a/includes/class-wc-structured-data.php b/includes/class-wc-structured-data.php
index 504427b6364..bac68582478 100644
--- a/includes/class-wc-structured-data.php
+++ b/includes/class-wc-structured-data.php
@@ -328,7 +328,7 @@ class WC_Structured_Data {
 	 * @param bool	    $plain_text    Plain text email (default: false).
 	 */
 	public function generate_order_data( $order, $sent_to_admin = false, $plain_text = false ) {
-		if ( $plain_text ) {
+		if ( $plain_text || ! is_a( $order, 'WC_Order' ) ) {
 			return;
 		}