Moved my code to client's Checkfront account, doesn't work.
I generated API key/secret on my client's account, but the same code that worked for on my account doesn't work on his account. Even simple example code using the PHP-SDK from the command line - I get "
[error] => invalid_grant
[error_description] => The access token provided is invalid.
He signed up for the Soho account. Is there a limitation that Soho accounts can't use the API?