having trouble with a custom API system here is some issue on problem
the admin thing is still broken – it seems completely unrelated to the API issue. Can you get this fixed?
The quoting seems to be working now, except for when you enter ISBNs that have an X at the end, although I am thinking that that has always been an issue and I just now caught it. The 13-digit version of ISBNs never has the X, only the 10-digit version (in case that helps in programming) and less than one in 10 …
