Fix fatal error in purchasing a subscription with PRB and ECE when the subscription's price or sign-up fee is a string (#3617)

* cast product price to float

* add changelog

* update return type

* always return float

Author: Mayisha

changelog.txt

@@ -9,6 +9,7 @@
 * Tweak - Include page URL information in the SSL-required log for the Stripe Express Checkout Element.
 * Fix - Fix ECE modal not loading on pay for order page when coupon is applied.
 * Fix - Do not load express payment buttons on switch subscription page.
+* Fix - Resolve a fatal error by casting product price and subscription sign up fee to 'float' while adding them.
 * Fix - Return 'is_live' as true in account summary response when test mode is disabled in gateway settings and charge is enabled in Stripe account.
 * Fix - Prevents notices being displayed on WordPress 6.7 due to loading translations too early (only shown on stores with WP_DEBUG enabled).
 * Tweak - Update links to plugin documentation and Stripe documentation.

includes/payment-methods/class-wc-stripe-express-checkout-helper.php

@@ -147,7 +147,7 @@ public function get_total_label() {
 	 * @param bool|null $is_deposit      Whether this is a deposit.
 	 * @param int       $deposit_plan_id Deposit plan ID.
 	 *
-	 * @return integer Total price.
+	 * @return float Total price.
 	 */
 	public function get_product_price( $product, $is_deposit = null, $deposit_plan_id = 0 ) {
 		// If prices should include tax, using tax inclusive price.
@@ -180,10 +180,10 @@ public function get_product_price( $product, $is_deposit = null, $deposit_plan_i
 
 		// Add subscription sign-up fees to product price.
 		if ( in_array( $product->get_type(), [ 'subscription', 'subscription_variation' ] ) && class_exists( 'WC_Subscriptions_Product' ) ) {
-			$product_price = $product_price + WC_Subscriptions_Product::get_sign_up_fee( $product );
+			$product_price = (float) $product_price + (float) WC_Subscriptions_Product::get_sign_up_fee( $product );
 		}
 
-		return $product_price;
+		return (float) $product_price;
 	}
 
 	/**

includes/payment-methods/class-wc-stripe-payment-request.php

@@ -366,13 +366,13 @@ public function get_button_label() {
 	 * @since 5.2.0
 	 *
 	 * @param object $product WC_Product_* object.
-	 * @return integer Total price.
+	 * @return float Total price.
 	 */
 	public function get_product_price( $product ) {
-		$product_price = $product->get_price();
+		$product_price = (float) $product->get_price();
 		// Add subscription sign-up fees to product price.
 		if ( in_array( $product->get_type(), [ 'subscription', 'subscription_variation' ] ) && class_exists( 'WC_Subscriptions_Product' ) ) {
-			$product_price = $product->get_price() + WC_Subscriptions_Product::get_sign_up_fee( $product );
+			$product_price += (float) WC_Subscriptions_Product::get_sign_up_fee( $product );
 		}
 
 		return $product_price;

readme.txt

@@ -119,6 +119,7 @@ If you get stuck, you can ask for help in the [Plugin Forum](https://wordpress.o
 * Tweak - Include page URL information in the SSL-required log for the Stripe Express Checkout Element.
 * Fix - Fix ECE modal not loading on pay for order page when coupon is applied.
 * Fix - Do not load express payment buttons on switch subscription page.
+* Fix - Resolve a fatal error by casting product price and subscription sign up fee to 'float' while adding them.
 * Fix - Return 'is_live' as true in account summary response when test mode is disabled in gateway settings and charge is enabled in Stripe account.
 * Fix - Prevents notices being displayed on WordPress 6.7 due to loading translations too early (only shown on stores with WP_DEBUG enabled).
 * Tweak - Update links to plugin documentation and Stripe documentation.