Users get product without verification

We are selling a digital licence key for a product and so our checkout goes to completed immediately rather than sitting in a pending queue and waiting for manual intervention.

On checkout the user must add email address etc and then go through process. Next page shows a line saying that we sent you a verification email, please verify – it also confirms the purchase of the product and gives the licence key. There is no way that the user can then alter the email address they’ve given previously nor do they need to do so, given that they have the details they need.