[TTPCA] Send receipts after succeeded or failed payments

[staskus]

Description

When the transaction is processed regardless of outcome (approved or declined), it must be possible to send a digital receipt to the customer in a confidential way.

Solution

Update the existing Email receipt button shown after successful payments to use the new endpoint. At the moment we have to collect the email address before the transaction for the backend to send the receipt automatically. That’s a bit of an unnatural flow, even if the merchant remembers.

Design

TBD