Paypal REST api call works from cURL but not from C# code

Question

I\'m trying to call Paypal api from my code. I set up the sandbox account and it works when I use curl but my code isn\'t working the same way, returning 401 Unauthorized instea

Answer 1

Paypal has deprecated TLS 1.1, and only accepts 1.2 now. Unfortunately .NET (prior to version 4.7) uses 1.1 by default, unless you configure it otherwise.

You can turn on TLS 1.2 with this line. I recomend placing it Application_Start or global.asax.

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;