UAT to Production Migration

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UAT Sign-Off
After completing Integration, send a test App to PhonePe for the sanity check. Production credentials will be shared post UAT sign-off by PhonePe.

Replace below parameters before going LIVE to production.

Parameter	Steps
`MerchantID`	Use the `merchantID` shared for Production
`Host URL`	Replace the UAT host URL in the Server API calls with https://mercury-t2.phonepe.com
`API keys`	Replace the UAT keys with the Production Keys for checksum/X-VERIFY header computation in all the API calls.
`PhonePe Package Name`	com.phonepe.app