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

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

This is where custom actions are added (in child classes) to run when an invitation or request is accepted.

Mark invitation as accepted by invitation ID.

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

Delete an invitation or invitations by query data.

Delete a request or requests by query data.

Is this user allowed to make a request in this situation?

Get a specific invitation by its ID.

BP Invitations class.