Disable Coupon Field on WooCommerce Cart and Checkout Pages Per Product

If you care about website performance and easier administration, I recommend reading my Code Snippet Solutions guide before adding code to your website.

Code Snippets, PHP
Cart, Checkout, Coupons, Hide

Instructions

Create a new PHP code snippet.
Copy the contents of code snippet below.
Paste the contents into your code snippet.
Review any notes that I’ve provided.
Save and enable the code snippet.
Test.

Snippet

Reasons for Hiding the Coupon Field

Performance: Keep people from using up server resources by repeatedly attempting to guess coupon codes when there aren’t any coupons that apply to a product
Administration: You don’t want people asking your team how they can obtain a coupon
Design: You simply want to keep the Cart and Checkout page cleaner for a particular product.

This code snippet will work for a single product. If you want to do this for multiple products, that would require a more complex code snippet or a plugin.

How to Hide the Coupon Field

Go to the products table within your WordPress dashboard (wp-admin/edit.php?post_type=product)
Hover over the name of the desired product and note the ID
Copy the code snippet below and add it to your website.
Adjust line 5, replacing 12345 with the product ID from step 2
Adjust line 26, replacing 12345 with the product ID from step 2

PHP

// HIDE COUPON FIELD ON THE CHECKOUT PAGE
function disable_coupon_field_on_checkout( $enabled ) {
    if ( is_checkout() ) {
 
        $product_id = 12345;
        $in_cart = false;
        
        foreach( WC()->cart->get_cart() as $cart_item ) {
           $product_in_cart = $cart_item['product_id'];
 
           if ( $product_in_cart === $product_id ) $in_cart = true;
        }
 
        if ( $in_cart === true )
        {
            $enabled = false;
        }
    }
    return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'disable_coupon_field_on_checkout' );
 
// HIDE COUPON FIELD ON THE CART PAGE
function disable_coupon_field_on_cart( $enabled ) {
    if ( is_cart() ) {
        $product_id = 12345;
        $in_cart = false;
        
        foreach( WC()->cart->get_cart() as $cart_item ) {
           $product_in_cart = $cart_item['product_id'];
 
           if ( $product_in_cart === $product_id ) $in_cart = true;
        }
 
        if ( $in_cart === true )
        {
            $enabled = false;
        }
    }
    return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'disable_coupon_field_on_cart' );

// HIDE COUPON FIELD ON THE CHECKOUT PAGE
function disable_coupon_field_on_checkout( $enabled ) {
    if ( is_checkout() ) {
 
        $product_id = 12345;
        $in_cart = false;
        
        foreach( WC()->cart->get_cart() as $cart_item ) {
           $product_in_cart = $cart_item['product_id'];
 
           if ( $product_in_cart === $product_id ) $in_cart = true;
        }
 
        if ( $in_cart === true )
        {
            $enabled = false;
        }
    }
    return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'disable_coupon_field_on_checkout' );
 
// HIDE COUPON FIELD ON THE CART PAGE
function disable_coupon_field_on_cart( $enabled ) {
    if ( is_cart() ) {
        $product_id = 12345;
        $in_cart = false;
        
        foreach( WC()->cart->get_cart() as $cart_item ) {
           $product_in_cart = $cart_item['product_id'];
 
           if ( $product_in_cart === $product_id ) $in_cart = true;
        }
 
        if ( $in_cart === true )
        {
            $enabled = false;
        }
    }
    return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'disable_coupon_field_on_cart' );

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