Option to disable PDF invoice or offer attachement


Is there a way to remove or tick an option on, not to send an offer in pdf in the attachment of the email?

For small and fast offers we would like to use online payment links, as we receive those instant.

We work in events, and we would like to sell early bird tickets based on a selection. Those who are picked, have to pay instantly and not by bankwire.

We already made a email templates with a online payment link, but still people open the PDF and pay by bankwire. That sometimes takes up to 7 days to receive.