Default Magento automatically sends a confirmation Email once the order is placed.
But it falls short in the cases such as payment is done via a third party payment gateway or if the card is declined and payment fails.
One needs a custom code to allow to send order confirmation Email after payment success in Magento 2.
Start sending the order confirmation Emails to your customers only after the payment is successful!
Get the code at https://meetanshi.com/blog/send-magento-2-order-confirmation-email-after-payment-success/
