Are there guidelines on where the button needs to be visible? Would it be enough to have it in the order confirmation email?
An order confirmation email alone is not sufficient. The requirement is for a button or hyperlink on your website – clearly visible, available to every customer including those not logged in, at any point within the 14-day window. An email link that expires or becomes unreachable does not meet the legal standard. The function must be on-site and easy to find.