Apply Coupon to Specific Variation

Hi guys,

I’ve seen a similar question asked to what I’m after (see link – add coupon exclusion by attribute) but a solution wasn’t provided. It was suggested that “you can exclude specific variations (say a red version of a t-shirt) from a coupon just like you would a normal product.”

Look at any product on https://amurphyphotography.com.au/ and you’ll see I have 3 different variations per product under the attribute “Print Type” and I only want a coupon to apply to the “HD Canvas” variation. Is there a simple solution to this? I already have code that performs an action if the “Framed Print” variation is selected, but I can’t figure out how to manipulate it for this coupon issue. The code I use is below:

/** DISABLE ADD-TO-CART BUTTON IF FRAMED PRINT VARIATION IS SELECTED */
add_filter( 'woocommerce_variation_is_purchasable', 'conditional_variation_is_purchasable', 20, 2 );
function conditional_variation_is_purchasable( $purchasable, $product ) {

    ## ---- Your settings ---- ##
    $taxonomy  = 'pa_print-type';
    $term_name =  'Framed Print';

    ## ---- The active code ---- ##
    $found = false;

    // Loop through all product attributes in the variation
    foreach ( $product->get_variation_attributes() as $variation_attribute => $term_slug ){
        $attribute_taxonomy = str_replace('attribute_', '', $variation_attribute); // The taxonomy
        $term = get_term_by( 'slug', $term_slug, $taxonomy ); // The WP_Term object
        // Searching for attribute 'pa_size' with value 'XL'
        if($attribute_taxonomy == $taxonomy && $term->name == $term_name ){
            $found = true;
            break;
        }
    }
    if( $found )
        $purchasable = false;

    return $purchasable;
}

I’d greatly appreciate any help you could provide.

The page I need help with: [log in to see the link]