A couple of years ago we are using it to manage the payments of our mercadopago connect platform. Until now the process of connecting users [1] and renewing credentials [2] had been working perfectly, but for a while I have stopped working with errors like
Error validating grant. Your authorization code or refresh token may be expired or it was already used.
Or directly
invalid_token
I understand that the first error should give me if I already use the token to try a renewal, but it is not the case, and the second error does not say much more.
Is the same thing happening to someone? you know if there was any unproven change in the API.
Thanks
[1] link
[2] link