Hello.
I'm using Amazon login with account linking using grant_type: 'refresh_token'. The problem is that at some point Amazon server starts to reject my refresh token and I do not see the reason behind it.
Server responds: {"error_description":"The request has an invalid grant parameter : refresh_token","error":"invalid_grant"}.
Documentation says: The authorization code is invalid, expired, revoked, or was issued to a different client_id
. However, authorization code has nothing to do with refreshing the access token.
Thank you for any help.
Best,
Urban