Get user latest order ID

Hey,

On my website, when someone orders a specific product, he is redirected (using the “Thanks You URL” field in the product data) to a page where the customer have to fill out a form (made with Contact Form 7 obviously).

What I would want is to get the latest order ID from the customer (knowing that he has to be logged in to order) and put it in the email sent to me and the customer when the form is filled.

Any idea on how someone could do that ?

Thanks !