Functions to give or remove access to LearnDash courses

ld_woosubs_course_access.php

// Remove Access to the course linked to the subscription key
function remove_course_access( $user_id, $subscription_key ) {
		
	// Get the course ID related to the subscription
	$subscription = WC_Subscriptions_Manager::get_subscription( $subscription_key );
	$courses_id = get_post_meta($subscription['product_id'], '_related_course', true);

	// Update access to the courses
	if ($courses_id && is_array($courses_id)) {
		foreach ($courses_id as $course_id) {
			ld_update_course_access($user_id, $course_id, $remove = true);
		}
		
	}
}


// Give Access to the course linked to the subscription key
function give_course_access( $user_id, $subscription_key ) {

	// Get the course ID related to the subscription
	$subscription = WC_Subscriptions_Manager::get_subscription( $subscription_key );
	$courses_id = get_post_meta($subscription['product_id'], '_related_course', true);


	// Update access to the courses
	if ($courses_id && is_array($courses_id)) {
		foreach ($courses_id as $course_id) {
			ld_update_course_access($user_id, $course_id, $remove = false);
		}
		
	}
}

how to get only course id