add variable product to cart woocommerce

add-to-cart-wc-variable-product.php

<?php
    // Get the WooCommerce Shop URL
    $store_url          = get_site_url();

    // Action to perform: lets add product to cart
    $action             = "/?add-to-cart=";

    // The product ID that we want to add.
    $productID          = "375";

    // Variation parameter name
    $variation_param    = "&variation_id=";

    // Product variation ID
    $variation_id       = "377";

    //Product variation name 
    $attribute_name     = "&attribute_pa_pro-subscription=";

    // The product attribute name value
    $attribute_value    = "12-months-subscription";

    // full link to add a product
    define('ADD_PRODUCT_TO_CART', $store_url.$action.$productID.$variation_param.$variation_id.$attribute_name.$attribute_value);
 ?>


<a id="buy" href="<?php echo ADD_PRODUCT_TO_CART; ?>">Buy this!</a>