Integration Needed	Details
Mini App Frontend	Opens the redirection url provided by backend. SDK integration will be available in upcoming version.
Mini App Backend	Calls GoPay backend to obtain redirection url.

Sequence Diagram:

Mini app payments Flow diagram

1. User Initiate Order

2.[Merchant owned]

Step 3:[BI-SNAP Core API] Fetch Merchant Access Token

In order to initiate order with Super App Backend Merchant access token is needed for verification purposes. This access token can be fetched by v1.0/access-token/b2b [BI-SNAP Core API]
The Api returns the access token which can be used for all other payment oriented APIs.
The contract of the API can be found here

Step 4:[Merchant owned]

Step 5:[BI-SNAP Core API] Payment Host to Host

Using Merchant Access token from step 3, Payment Creation with Super App backend can be initiated by V1.0/debit/payment-host-to-host [BI-SNAP Core API]
The contract of the API can be found here
The merchant payment can be Guest Checkout Payment with Payer information unknown at the point.
The merchant guest payment should have additionalInfo.pointOfPurchaseId which is shared by GoPay upfront.

Step 6: Super App Payment creation response

Super App Backend returns response to the merchant backend with necessary info for payments
- webRedirectUrl -> Payment deeplink
- ReferenceNo -> GoPay Order Id

Step 7: Merchant payment creation response

Merchant Backend returns response to Merchant Frontend with contract owned by Merchant team.

Step 8: FE Pay

The Mini App front end can open the Super App Payment page using the launchPayment from step 5.
SDK: MiniAppSDK version: 0.3.19
Gopay App Version - 1.45.0
Once the payment is completed, the Super App front end automatically redirects to the merchant page with payment status.

Step 9:[BI-SNAP Core API] Notify

New GoPay Merchants:

If you have not integrated with GoPay or have integrated without following the BI-SNAP Core API convention, the following points apply :

You must first onboard BI-SNAP Core API convention first using this section Onboard to BI-SNAP Core API.
Once the BI-SNAP Core API onboarding is complete, you can follow Existing GoPay Merchant.

If you have already integrated with GoPay and follow the BI-SNAP Core API convention, the following points apply :

There is no change in the already integrated v1.0/access-token/b2b BI-SNAP Core API.
For v1.0/debit/payment-host-to-host api, the new field in the existing contract needs to be added under additionalInfo.pointOfPurchaseId. The value for this is shared by the GoPay Team.
There is no change in the already integrated v1.0/debit/notify BI-SNAP Core API.