Customer chooses to pay by Paytm -> Is redirected to Paytm gateway -> Magento IMMEDIATELY sends out an Order Confirmation Email to the customer, before he even completes the payment.
Customer shuts down browser without making payment because he thinks he paid already. Magento says the order is processing so I (a seller) assume payment has been completed. But when I manually check the payment status in merchant.paytm.com - payment hasn't been made at all (customer closed browser after full page load).
How to set up Magento/Paytm extension, so that the Order confirmation is sent to customer AFTER he completes the payment?