Method: This is where custom actions are added (in child classes) to run when an invitation or request needs to be “sent.”

Method: Mark invitations as sent that are found by user_id, inviter_id, invitee_email, class name, optional item id, optional secondary item id.

Method: Update invitation, based on provided filter parameters.

Method: Accept invitation, based on provided filter parameters.

Method: Accept invitation, based on provided filter parameters.

Method: Check whether an invitation exists matching the passed arguments.

Method: Check whether a request exists matching the passed arguments.

Method: Get invitations, based on provided filter parameters.

Method: Get requests, based on provided filter parameters.