WooCommerce Print Invoice, Packing Slip, Delivery Note & Label Plugin helps you to generate and print Invoices, Packing List, Delivery Note and Shipping/Address labels in PDF format within WooCommerce Order page. The invoice and packing slip will be automatically generated at the time of order completion.
Code Snippet to replace Invoice Name.
Below code snippet will let you replace invoice name. You have to customize the below code according to the invoice name you are using.