Add explanation to the Error Encountered message
Currently when someone has already opted in or purchased a product this error message occurs (see below) Can you add a line that says this may be caused because you purchased a product or already opted in? It would save us a lot of time and effort explaining each time it occurs. thanks,:
We have encountered an error. Please correct this/these error(s) before continuing.
Sorry, you have followed a malformed or expired link.
Press BACK to correct the errors.