# In-app payment flow

1. Buyer selects a product and places order within your (merchant) app.

2. Your app invokes UPI with required information such as, receiver VPA, amount,
   reference.

3. iOS displays **Pay with Google Pay** option, which is capable of
   handling UPI. Buyer selects Google Pay to make the transaction.

4. Google Pay does the transaction and presents the buyer with
   information about it.

5. If the Google Pay response status is **Submitted** or **Succeeded**,
   you must check with your PSP or payment aggregators to ensure that the
   correct order amount is paid.