Change E-Mail subject and body

Hello

There are filters you can use for this:

add_filter( 'wc_cart_pdf_email_copy_subject', function( $subject ) {
    return 'your custom subject';
} );

add_filter( 'wc_cart_pdf_email_copy_body', function( $subject ) {
    return 'your body here';
} );

Here is the code that sends the admin email, you can use this to create your own email to send elsewhere if you’d like:

https://github.com/dkjensen/wc-cart-pdf/blob/master/includes/modules/copy-admin.php