[Cannot make a successful request - JWT error]

I am trying to send a GET request to https://api.accounting.sage.com/v3.1/contact_allocations to return all contact allocations.

The only header  I am adding is an authorization header containing the access token in the form "Bearer xxx...xxx"

[Cannot make a successful request - JWT error]

I have managed to request an authorization code, and convert it into an access token.

However, when I then make a request using the access token, I get an "Unauthorised Access" error,  the JSON response being:-

[{"$severity":"error","$dataCode":"AccessTokenVerificationError","$message":"Access token is invalid (JWT malformed or missing).","$source":"Authorization"}]

I am not doing any encoding or decoding.  I am simply using the access token as it is presented to me.  

Can anyone tell me what is going wrong?

[Issue with oauth2.0 access token]

On 1/25/2022 at 10:51 AM, Joshua Press said:

Just fixed the problem. 

The problem was that I was using the code exactly as it came from the URL (encoded): GB%2Fxxxxxxxxxxxxxxx and that does not work. I've decoded the code, becoming something like: GB/xxxxxxxxxxxx and now it works.

An easy fix actually, but I've overlooked it. Since this seems to be an often asked question, I hope this may help someone save a few hours. 

Thanks!!!  It is a pity the official documentation cannot include such a simple, but critical bit of information.