Am working with creating a 'Future Payments Server-Side Integration', I already implemt the client-side in the android app and working fine to get the Authorization Code but the problem is when I try to get the refresh token I always get 401. Im following the documentation in this url https://github.com/paypal/PayPal-Android-SDK/blob/master/docs/future_payments_server.md#create-a-pay...
the request is am not sure about the -H Authorization, I put the clientId, I have tested with the secret. but nothing work.
curl 'https://api.paypal.com/v1/oauth2/token' \
-H "Content-Type: application/x-www-form-urlencoded" \
-H "Authorization: Basic QWZV...==" \
-d 'grant_type=authorization_code&response_type=token&redirect_uri=urn:ietf:wg:oauth:2.0:oob&code=EBYhRW3ncivudQn8UopLp4A28...'
