Disable payment gateways when the cart only contains subscriptions with free trial (allowing customers to purchase the subscription without adding any payment information)

disable_payment_gateways_on_trial_sub.php

<?php
// Disable Automatic Payments when the cart only contains subscriptions with free trial (allowing customers to purchase the subscription without adding any payment information)
add_filter('option_woocommerce_subscriptions_turn_off_automatic_payments','disable_payment_gateways_on_trial_sub', 1);
function disable_payment_gateways_on_trial_sub($automatic_payments_off){
	if(!is_admin()){
		$all_trial = WC_Subscriptions_Cart::all_cart_items_have_free_trial();
		if($all_trial==1){
			// All items in the cart contain a free trial	
			return 'yes'; // Turn off automatic payments (disabling payment gateways)
		}
	}
	return $automatic_payments_off;
}
?>