Hi Patrik,
Thank you very much for your reply. Here are the steps that can help you replicate the issue:
1) Sign in as a front-end user and submit a paid listing
2) Use a discount code at checkout
3) Pay using Stripe (I have only tried this in Test Mode)
[this should work fine]
4) Try to create another paid listing (a new one)
5) Use the same discount code that you used before
If my theory is correct, then the first time you check out it will work just fine. However, if you decide to create another listing, it will fail with the error mentioned.
Please note that I have not had any issues with anyone signing up and getting this error message. However, I have not started using discount codes yet (so I don’t know whether this will affect others). Perhaps the issue is related only to the test environment. Perhaps it only affects the SAME user trying to buy another listing with the same discount code, which will likely never happen so it’s not a big deal. In any case, I just need to be sure that it will not be a problem to use discount codes.
Thanks very much guys!