Try these test beneficiary account details to understand possible responses

bene_account_numberResponse
1111111111{"message":"Transaction failed during processing, due to Beneficiary account is blocked/frozen. [Sandbox]","status":412}
2222222222{"message":"Transaction amount limit exceeded or no limit configured. Please call Customer Care/Branch [Sandbox]","status":412}
3333333333{"data":{"amount":"1.00","open_transaction_ref_id":"opentxn100852","transaction_status_id":21,"transaction_types_id":"4","purpose":"purpose_365Pv","recepient_name":"MOHAMMEDFARISK","email_id":"[email protected]","mobile_number":"7558042380","merchant_ref_id":"IZRnxv050F","debit_account_number":"000205026539","bank_error_message":null,"created_at":"10-05-2020 13:44:54"},"status":200}
4444444444{"data":{"amount":"1.00","open_transaction_ref_id":"opentxn100853","transaction_status_id":15,"transaction_types_id":"4","purpose":"purpose_C8Psq","recepient_name":"MOHAMMEDFARISK","email_id":"[email protected]","mobile_number":"7558042380","merchant_ref_id":"C5WcWtF7rM","debit_account_number":"000205026539","bank_error_message":null,"created_at":"10-05-2020 13:45:37"},"status":200}
any other numbers{"message":"Invalid IFSC Code/ Account number. [Sandbox]","status":412}

UPI Payout Response

vpaResponse
open.success@icici{ "data": {
"amount": "10.00",
"open_transaction_ref_id": "opentxn114908",
"transaction_status_id": 1,
"transaction_types_id": 21,
"purpose": null,
"recepient_name": "1223",
"email_id": "[email protected]",
"mobile_number": "7668694073",
"merchant_ref_id": "48qsa1140q202",
"debit_account_number": "36361338087",
"bank_error_message": null,
"created_at": "06-05-2021 22:02:14"
},
"status": 200
}
open.balance@icici{
"message": "Transfer could not be initiated due to low balance",
"status": 412
}
open.failed@icici{
"message": "Payment Failed",
"status": 412
}
any other UPI IDs{
"message": "Invalid UPI ID",
"status": 412
}