Auto Apply Coupon

Automatically applies a predefined coupon code to the cart.

PHPPHP
/**
* Snippet Name:     Auto Apply Coupon
* Snippet Author:   coding-bunny.com
* Description:      Automatically applies a predefined coupon code to the cart.
* Version:          1.1.0
*/

define('COUPON_AUTO_APPLY_CODE', 'YOUR_COUPON_NAME_HERE');

function cbacd_apply_coupon_automatically() {
if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;

    if ( ! WC()->cart ) return;

    $coupon = new WC_Coupon( COUPON_AUTO_APPLY_CODE );
if ( ! $coupon->get_id() || ! $coupon->is_valid() ) {
return;
}

    if ( ! WC()->cart->has_discount( COUPON_AUTO_APPLY_CODE ) ) {
WC()->cart->apply_coupon( COUPON_AUTO_APPLY_CODE );
}
}
add_action( 'woocommerce_before_calculate_totals', 'cbacd_apply_coupon_automatically', 10 );