503 (Service Unavailable) on javascript example/guest code

[saurabhgokhale]

Credit/debit card "make payment" example source code given under example/guest gives 503 (Service Unavailable) error on staging environment.

503 means exception from callers side but it does not give any other information as to what data is being sent wrong or missing.

Following is the relevant information:
URL: https://stgadmin.citruspay.com/service/moto/authorize/struct/extended
Method: POST
Data:
{
"merchantAccessKey": "LY80PJEZK5TDFWKATHTL",
"merchantTxnId": "mtx10228211",
"amount": {
"currency": "INR",
"value": "41"
},
"returnUrl": "http://localhost:8420/pg/response",
"requestSignature": "931c7d5b4216449d96aa1dbe758a6c5da4f44261",
"userDetails": {
"firstName": "",
"lastName": "",
"email": "foo@bar.com",
"mobileNo": "",
"address": {
"street1": "",
"street2": "",
"city": "",
"zip": "",
"state": "Karnataka",
"country": "INDIA"
}
},
"customParameters": {
"paramOne": "one value",
"secundo": "online"
},
"paymentToken": {
"type": "paymentOptionToken",
"paymentMode": {
"type": "credit",
"scheme": "VISA",
"number": "4111111111111111",
"holder": "test",
"expiry": "04/2019",
"cvv": "123"
}
}
}