Assign membership on registration in membership 2 pro

code.php

<?php

add_action( 'user_register', 'assign_membership_on_register', 10, 1 );
function assign_membership_on_register( $user_id ) {
	
	$membership_id = 1343;
	$member = MS_Factory::load( 'MS_Model_Member', $user_id );
	$subscription = $member->add_membership( $membership_id );
	
	if ( $member->has_membership() ) {
		$member->is_member = true;
	} else {
		$member->is_member = false;
	}
	$member->save();
	
}