To authenticate the Adestra you will need to setup an API user with the required access rights. Please see the Adestra (https://app.adestra.com/doc/page/current/index/admin/users/users on setting up a user.
The account, username and password will be required to authenticate the connector.
Authenticating the connector Username:
This should be perpended with the lower-case account name and a dot (e.g. my_account.username).
Password: password of the API user
Because the Adestra system has tables, some method calls require a table ID. You can call the List Core, and List Data table methods to find the ID.
The contact methods have the default ID and Email specified; you can add custom fields as specified on the method for the required table. You can download the table definition from the Adestra portal or via the connector table methods.