Customize The Word on WooCommerce Print Invoices & Packing Lists

Hi, Due to GST (VAT) requirement in Malaysia, we need to change the word Invoice to Tax Invoice. Please find the snapshot here: [login to view URL] We have contacted skyverge support and their reply as follows: "You can use the wc_pip_document_heading filter to change the title of the invoice." [login to view URL] === WooCommerce Print Invoices/Packing Lists === Author: skyverge Tags: woocommerce Please quote for this customization. Thank you.