Change Invoice to Tax Invoice Paid Memberships Pro

rename_invoice.php

<?php

/**
 * Change all 'invoice' to 'tax invoice'
 * Add this code to PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function theme_change_comment_field_names( $translated_text, $text, $domain ) {

        switch ( $translated_text ) {

            case 'Invoice #' :

                $translated_text = __( 'Tax Invoice #', 'paid-memberships-pro' );
                break;
            
            case '&larr; View All Invoices' :

                $translated_text = __( '&larr; View All Tax Invoices', 'paid-memberships-pro' );
                break;

            case 'No invoices found.' :

                $translated_text = __( 'No tax invoices found.', 'paid-memberships-pro' );
                break;
           
          case 'Invoice #%s on %s' :

                $translated_text = __( 'Tax Invoice #%s on %s', 'paid-memberships-pro' );
                break;
            
            
        }

    return $translated_text;
}
add_filter( 'gettext', 'theme_change_comment_field_names', 20, 3 );