/**
* Represents the name of the OAuth service.
*
* This can be given as a class name if there isn't a service already defined within the OAuth library.
* e.g. '\XF\ConnectedAccount\Service\ProviderId' or 'XF:Service\ProviderId'
*
* You can check if a service already exists by looking in 'src/vendor/lusitanian/oauth/src/OAuth/OAuth(1|2)\Service'
*
* @return string
*/