Collect your test credentials for UAT environment to connect and test with JPSL PG. These credential includes - UAT Merchant Identifer (MID) and UAT Secret Key for Hash calculations.
Identify your integration requirement,
Go through the Base Integration and Generate Hash guides to establish connectivity with Payment Gateway
If your integration is for Jio Payment Solutions Limited hosted checkout,
1. Check your Initiate Sale API, integration by integrating the API according to specification.
2. Once Initiate Sale API is working as expected, in response

Testing credential

Please find the UPI Intent call procedure:

Merchant to call generateQR API (its a server to server API). Refer Generate QR API reference
The response will contain the QRString (as per standard NPCI UPI QR Specs)
The QR String as is can be used as intent URL OR can be used to generate a QR Image for scanning.
Merchant to either open the intent or display the QR Image and in the background wait for status update from the merchant server.
On Payment, the response from UPI Acq will come to JioPay PG and the transaction will be updated as success/reject.
If advice is enabled for the merchant, the merchant advice will be triggered by JioPay PG to merchant specified advice URL (B2B)

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Above mentioned steps are only for UAT environment