Issue: Order confirmation email send to customer for declined payment.

What I expected

Order confirmation email should send only if payment is confirmed.

What happened instead

Customer receiving order confirmation email for declined payment.

Steps to reproduce the issue

Added a product to the cart
Go to the cart page, and click on the Amazon Pay button to proceed to checkout.
Use a credit card in Amazon Pay where the payment is declined.

Your setup

Magento version: 2.4.6-p7
Amazon Pay Extension Version: 5.17.1
Magento Edition: Enterprise Cloud

More details about the issue:

The issue is happening due to the AmazonPay module is placing an order before the payment is initialized here https://github.com/amzn/amazon-payments-magento-2-plugin/blob/658f83185f63ff36d5a6416e7f4740a293412c62/Model/CheckoutSessionManagement.php#L873 It uses Magento's placeOrder method to place the order, and I found that Magento triggers the order confirmation email after the order is placed via the event sales_model_service_quote_submit_success through the observer https://github.com/magento/magento2/blob/df07984301dc3aa80958544f20d1c28141a1e105/app/code/Magento/Quote/Observer/SubmitObserver.php#L62

So in this case, when a user places an order with AmazonPay, they will always receive the order confirmation email without the payment status being checked.

Solution:

I have created a beforeExecute plugin for the observer (sales_model_service_quote_submit_success) to prevent the order confirmation email from being triggered before the payment is completed by AmazonPay.

public function beforeExecute(SubmitObserver $subject, Observer $observer): array
    {
        $order = $observer->getEvent()->getOrder();
        $payment = $order->getPayment();
        $method = $payment->getMethodInstance();
        $methodCode = $method->getCode();
        if (stripos($methodCode, 'amazon_payment') !== false) {
            $order->setCanSendNewEmailFlag(false);
         }
         return [$observer];
      }

Trigger an order confirmation email after payment confirmed here https://github.com/amzn/amazon-payments-magento-2-plugin/blob/658f83185f63ff36d5a6416e7f4740a293412c62/Model/CheckoutSessionManagement.php#L642

amzn / amazon-payments-magento-2-plugin

Issue: Order confirmation email send to customer for declined payment. #1251