Make certain WooCommerce products not-purchasable for non-members

stop-pmpro-members-from-buying-woocommerce.php

<?php

/** 
 *  Stop non-members from purchasing products if they do not have an active Paid Memberships Pro Level.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function stop_pmpro_members_from_buying_woo( $is_purchasable, $product ) {

	// Check if the user has an active membership level.
	if( pmpro_hasMembershipLevel() ) {
		return false;
	}

	return $is_purchasable;

}
add_filter( 'woocommerce_is_purchasable', 'stop_pmpro_members_from_buying_woo', 10, 2 );