add_action( 'mycred_transfer_completed', 'add_bonus_points', 10, 2 );
function add_bonus_points( $transfer_id, $request ) {

	// Amount charged
	$transfer_amt = $request['charge'];

	// Amount actually transferred
	$transfer_amt = $request['payout'];

	// Senders ID
	$sender = $request['sender_id'];

	// Recipients ID
	$recipient = $request['recipient_id'];

	// Point Type
	$point_type = $request['point_type'];

	mycred_add( 'Transfer Bonus', 3, $transfer_amt, 'Bonus');

	return;
}