Exclude Wholesale Customers from receiving the PDF Invoice

/**

 * Exclude wholesale roles from receiving the PDF Invoice attachment in emails.

 *

 * Wholesale Suite roles on this site:

 *   - wholesale_customer (Wholesale Customer)

 *   - wholesale_vip (Wholesale VIP)

 *

 * Plugin: WooCommerce PDF Invoices & Packing Slips

 * Hook: wpo_wcpdf_document_is_allowed

 */

add_filter( 'wpo_wcpdf_document_is_allowed', function( $allowed, $document ) {

    // Only target the Invoice document type

    if ( 'invoice' !== $document->get_type() ) {

        return $allowed;

    }

    $order = $document->order;

    if ( ! $order instanceof WC_Order ) {

        return $allowed;

    }

    $customer_id = $order->get_customer_id();

    if ( ! $customer_id ) {

        return $allowed; // Guest order — no role to check

    }

    $wholesale_roles = [

        'wholesale_customer',

        'wholesale_vip',

    ];

    $user = get_userdata( $customer_id );

    if ( $user && array_intersect( $wholesale_roles, (array) $user->roles ) ) {

        return false; // Block the invoice attachment for wholesale users

    }

    return $allowed;

}, 10, 2 );