WooCommerce subscriptions without credit card

functions.php

<?php

// Free Trial - Let GF Reg use email as username
/**
 * WordPress register with email only, make it possible to register with email 
 * as username in a multisite installation
 * @param  Array $result Result array of the wpmu_validate_user_signup-function
 * @return Array         Altered result array
 */
function custom_register_with_email($result) {
 
   if ( $result['user_name'] != '' && is_email( $result['user_name'] ) ) {
 
      unset( $result['errors']->errors['user_name'] );
 
   }
 
   return $result;
}
add_filter('wpmu_validate_user_signup','custom_register_with_email');
 
 
// Free Trial - Auto login after reg
 
add_action( 'gform_user_registered', 'pi_gravity_registration_autologin', 10, 4 );
/**
 * Auto login after registration.
 */
function pi_gravity_registration_autologin( $user_id, $user_config, $entry, $password ) {
	$user = get_userdata( $user_id );
	$user_login = $user->user_login;
	$user_password = $password;

    wp_signon( array(
		'user_login' => $user_login,
		'user_password' =>  $user_password,
		'remember' => false
    ) );
}





// Free Trial Over Hook

function grow_trial_redirect(){
	global $user_ID;
	$user = get_userdata( $user_ID );

    if( !isset( $user->user_login ) ){ // we only want this to run when credentials have been supplied
        return;
    }
	
	// only apply to free trial users    
	if (!current_user_can( 'free_trial' ) || current_user_can( 'manage_options' )) {
		return;    
    }
    
  
    if( get_trial_days() > 15 && !is_front_page()){
	      wp_redirect(wc_grow_payment_page()); 
	      exit;
    } else {
		return;
    }
}
add_action('template_redirect', 'grow_trial_redirect', 10, 3);


// get trial days left

function get_trial_days() {

	global $user_ID;
	$user = get_userdata( $user_ID );

    $regtime = strtotime($user->user_registered);
    $now = strtotime("now");
    $diff = $now - $regtime;
    $days = $diff / 60 / 60 / 24 ;
    $hours = $diff / 60 / 60;
    return round($days);
	
}

function get_trial_days_left() {
	
	return 15 - get_trial_days();

}

// show message for trial period

function trial_message() {

	if (!is_user_logged_in()) return;
	
	global $user_ID;
	$user = get_userdata( $user_ID );	
	$shopowner_allowed_roles = array('store_owner_free');	

	if( !array_intersect($shopowner_allowed_roles, $user->roles ) || is_checkout() || is_account_page()) return;
	
	
	if (get_trial_days_left() <= 0) {
		echo '<div class="wc-grow-trial-message">Trial Over <a href="'.wc_grow_payment_page().'">Purchase Now</a></div>';
	} else {
		echo '<div class="wc-grow-trial-message">You have '. get_trial_days_left() .' days left of your Trial. <a href="'.wc_grow_payment_page().'">Click here to upgrade.</a></div>';		
	}
	
}

add_action('wp_head','trial_message');

function wc_grow_payment_page() {
	return '/checkout/?add-to-cart=4031';
}