Due to a bug in Rapid APIs OAuth 2 implementation, only one scope can currently be requested. They are passing scopes in a comma delimited list. The OAuth 2 RFC states scopes should be passed in a space delimited list.
Once you get your token, please be sure to add "Bearer " before your token in the “Authorization” field to enable the integration.
Please sign up for a free developer account at https://labs.aweber.com. Our API documentation and code samples are available at https://api.aweber.com.