paypal express checkout - 400 bad request

Question

I'm using this instruction https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/advanced-integration/ to set up paypal. The only different is that I need to send data to CREATE_PAYMENT_URL endpoint, so I transfer it as second parameter

paypal.request.post(
                CREATE_PAYMENT_URL,
                JSON.stringify([{"name": "test", "price": 10}]),
                { headers: { 'Content-Type': 'application/json' } }

            )

after that I'm getting 400 error

{"success":false,"errors":{"statuscode":400,"message":"Invalid json message received"}}

Backend doesn't matter, cause it's never reached. Also I'm almost sure it worked fine few days ago Any ideas?

Fiddler screen

Answer 1

Try setting the second param to null, and send an options object as the third param with an object named json in the third with a plain JS object inside.

paypal.request.post(PAYMENT_URL, null, {
    json : {
        name:'test',
        price:10
      }
  })

It's not in the documentation, I was having similar issues but dug around in the source code to get it to work.