function bp_members_invitations_accepted_invitation_notification( $invite, $new_user, $inviter_id ) {

	// Notify all inviters.
	$args = array(
		'invitee_email' => $new_user->user_email,
		'accepted'      => 'all',
	);
	$invites = bp_members_invitations_get_invites( $args );

	if ( ! $invites ) {
		return;
	}
	foreach ( $invites as $invite) {
		// Include the id of the "accepted" invitation.
		if ( $invite->inviter_id === $inviter_id ) {
			$secondary_item_id = $invite->id;
		} else {
			// Else don't store the invite id, so we know this is not the primary.
			$secondary_item_id = 0;
		}
		$res = bp_notifications_add_notification( array(
			'user_id'           => $invite->inviter_id,
			'item_id'           => $new_user->ID,
			'secondary_item_id' => $secondary_item_id,
			'component_name'    => buddypress()->members->id,
			'component_action'  => 'accepted_invitation',
			'date_notified'     => bp_core_current_time(),
			'is_new'            => 1,
		) );
	}
}