php - How do I programmatically apply a coupon in Woocommerce for first order made by a customer? -

in woocommerce i'm trying find way apply 20% discount first order made new customer. appears can use functions woocommerce_after_checkout_validation , check_new_customer_coupon doesn't work.

function.php:

add_action('woocommerce_after_checkout_validation','check_new_customer_coupon', 0);  function check_new_customer_coupon(){     global $woocommerce;     // might change name of coupon     $new_cust_coupon_code = 'test';      $has_apply_coupon = false;      foreach ( wc()->cart->get_coupons() $code => $coupon ) {         if($code == $new_cust_coupon_code) {             $has_apply_coupon = true;         }     }      if($has_apply_coupon) {          if(is_user_logged_in()) {             $user_id = get_current_user_id();              // retrieve orders             $customer_orders = get_posts( array(                     'meta_key'    => '_customer_user',                     'meta_value'  => $user_id,                     'post_type'   => 'shop_order',                     'numberposts'=> -1             ) );              if(count($customer_orders) > 0) {                 $has_ordered = false;                  $statuses = array('wc-failed', 'wc-cancelled', 'wc-refunded');                  // loop thru orders, if order not falled failed, cancelled or refund consider valid                 foreach($customer_orders $tmp_order) {                      $order = wc_get_order($tmp_order->id);                     if(!in_array($order->get_status(), $statuses)) {                         $has_ordered = true;                     }                 }                  // if customer ordered, remove coupon                 if($has_ordered == true) {                     wc()->cart->remove_coupon( $new_cust_coupon_code );                     wc_add_notice( sprintf( "coupon code: %s applicable new customer." , $new_cust_coupon_code), 'error' );                     return false;                 }             } else {                 // customer has no order, valid use coupon                 return true;             }          } else {             // new user valid             return true;         }     }  } 

maybe can workaround putting on site :

with coupon xxxxxx 20 % off first commande

https://docs.woothemes.com/document/coupon-management/

and in coupon management put limitation 1 per user ?