Unauthorised Payment Error shown in Live Environment

[Usertest1]

I am using PayPal SDK of version 2.14.2 in my native Android Application. I successfully got the the response on Sandbox environment, but when I moved into Live, I got the error "UNAUTHORIZED_PAYMENT" when I made a payment via Credit/Debit card.

The complete message is:

{
  "name":"UNAUTHORIZED_PAYMENT",
  "message":"Unauthorized payment.", 
"information_link":"https://developer.paypal.com/docs/api/payments/#errors",
  "debug_id":"106a7750a4ad5"
}

The Currency Code I am using in my app and account is Newzeland(NZD).

Please help me for the same. Any help is appreciated.

Thanks