Paypal Internal Server Error Rest approval Payment - api

Question

I have a problem when creating an approval Payment using REST API.
i'm creating a payment with pyment_method = 'paypal'
while i'm sending to paypal server my json file as
"{"transactions":[
{"amount":{"currency":"USD","total":"12","details":{}},
"description":"This is the payment transaction description."}
]
,"links":[],
"intent":"sale","payer":{
"funding_instruments":[],"payment_method":"paypal"}
}"
this is
result: Object
debug_id: "086b180fbe2f1"
information_link: "https://developer.paypal.com/webapps/developer/docs/api/#INTERNAL_SERVICE_ERROR"
message: "An internal service error has occurred"
name: "INTERNAL_SERVICE_ERROR"

Answer 1

Paypal frequently returns internal server error. This is common in sandbox mode.
The most common is to try again and get execute.
Try:
https://github.com/paypal/rest-api-sdk-nodejs/issues/1

Answer 2

You are including elements you shouldn't be, and missing important ones. If you are setting up a PayPal payment you need to have cancel and return urls:
{
"redirect_urls":{
"return_url":"http://<return URL here>",
"cancel_url":"http://<cancel URL here>"
},
"transactions":[
{
"amount":{
"currency":"USD",
"total":"12.00"
},
"description":"This is the payment transaction description."
}
],
"intent":"sale",
"payer":{
"payment_method":"paypal"
}
}
See Accepting a PayPal Payment for a guide

Answer 3

In my case I set the Content-Type header to application/json and get meaningful response:
{"name":"MALFORMED_REQUEST","message":"Incoming JSON request does not map to API request","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#MALFORMED_REQUEST","debug_id":"688b8ab4b2895"}
Instead of:
<ns1:XMLFault xmlns:ns1="http://cxf.apache.org/bindings/xformat"><ns1:faultstring xmlns:ns1="http://cxf.apache.org/bindings/xformat">java.lang.NullPointerException</ns1:faultstring></ns1:XMLFault>