We can get coupon Detain in woocommerce

getcoupon.php

 if (function_exists('get_field')) {
        $poss_coupon_code = get_field( "global_coupon", 35445 );

        if($poss_coupon_code) {
            global $woocommerce;
            $coupon_object = new WC_Coupon($poss_coupon_code);
            if($coupon_object->get_discount_type() == "percent") {
                $discounted_coupon_amount = $coupon_object->get_amount();
               
            }
        }
    }