Playing around with a mobile app’s IA

I have an app which contains several features and among them payment.

A user selects the amount to pay, selects a payment method and then the payment occurs. After the payment occurs, we show the user a receipt page.

My question lies here: once I'm in payment mode, the back button in the mobile (iOS) will take the user to Home.

Once I'm at the receipt screen, can I have the back button take the user to order history or would that be too confusing to the users?

Any advice is welcome. Thanks.