When a customer makes a payment for a booking, on the payment gateway provider form, there will be a tick in button for the customer to select.
When selected, after the booking payment is successful, the customer will receive a copy of their receipt emailed to the email address provided for the booking.
They will also be able to download a copy direct from a link on their booking emails if they misplace the emailed receipt.
After making the payment, the customer will also have the option to download a copy of the receipt after the payment is made straight from the confirmed screen.