WooCommerce apply coupon via url

If you’re unfamiliar with Programming then you may checkout

Advance Coupons for Woocommerce plugin which can extends default WooCommerce coupon features.

The example url must be look like:

https://springdevs.com/?coupon_code=DiscountCode

At first You need to check url & find coupon code. Then you need to set code into session because of You can’t run WC()->cart->apply_coupon($coupon_code) on init hook for some valid reasons.

add_action('init', "set_coupon_url");

function set_coupon_url() {
   if (isset($_GET['coupon_code'])) {
      $coupon_code = esc_url($_GET['coupon_code']);
      WC()->session->set('coupon_code', $coupon_code);
   }
}

Now, Check coupon is valid or Already not inserted in cart and apply coupon.

add_action("woocommerce_add_to_cart", "apply_coupon_via_url");
add_action("woocommerce_before_cart", "apply_coupon_via_url");

function apply_coupon_via_url() {
   $coupons = WC()->cart->get_applied_coupons();
   $code = WC()->session->get('coupon_code');
   $coupon_id = wc_get_coupon_id_by_code($code);

   // if coupon is invalid then return;
   if ($coupon_id == 0) return;

   if (in_array($code, $coupons)) {
         WC()->session->__unset('coupon_code');
   } else {
         WC()->cart->apply_coupon($code);
         WC()->session->__unset('coupon_code');
   }
}

Thanks.