Decline an invitation to a group.
This required parameter is membership ID for the member. It must be a valid long value.
An authenticated member can invoke this service and it must match the member specified in the URL as the membership object or be an administrator.
In other words, this service can only be used by a member to decline an invitation that they have received. It can also be used to decline an invitation on behalf of another member by an administrator.
When successful, it is always:
|Cause / Description
|When the supplied membership ID (MemberForGroup id) is invalid
|When the member has already accepted the invitation