PDF Invoice Title Caps | WordPress.org

Hi @devrichtercaterers:

Try this code snippet I just wrote for you:

/**
 * PDF Invoices & Packing Slips for WooCommerce:
 * Capitalize the "Invoice" in the document file name
 */
add_filter( 'wpo_wcpdf_filename', function( $filename, $document_type, $order_ids, $context ) {
    $new_filename = str_replace( 'invoice', 'Invoice', $filename ); 
    return $new_filename;
}, 10, 4 );

If you haven’t worked with code snippets (actions/filters) or functions.php before, read this guide: How to use filters