Thank you Anna,
My site connects students already approved in a university discipline (vendor) with those who are still attending (client). Usually, the purchase occurs near the test date. I can not leave the vendor information visible on the site, because as they are in the same environment, they would not buy through the site. When the sale occurs, the customer’s data goes to the vendor. If the vendor is not fast enough it generates an unpleasant situation. It is for this reason that the vendor contact on the customer email, after the payment seems to me to be a possible flow.