Statement descriptors require at least one alphanumeric character

Raised by @priojk in #287 (closed)

I got the same error response in the past. In my case, I set the title of the contribution page to just "." and did not consider that its value was used for the statement descriptor. As it apparently did not contain one alphanumeric character, Stripe complained with the above message. However, it did not result in any duplicate transactions and is probably unrelated to your issue.