Allow Subscriptions Product on BOGO and Add Product Search Field

add_filter( 'acfw_product_search_allowed_types' , 'acfw_search_add_support_for_subscription_products' );

function acfw_search_add_support_for_subscription_products( $product_types ) {

    $product_types[] = 'subscription';

    $product_types[] = 'variable-subscription';

    $product_types[] = 'subscription_variation';

    return $product_types;

}