Hello,
I have a question related to the public iTunes Search API: https://performance-partners.apple.com/search-api
Do all the books have an ISBN associated? I used to do queries like: https://itunes.apple.com/lookup?isbn=9781501110368. That book is available on Apple Books here: https://books.apple.com/us/book/it-ends-with-us/id1052928247 and the endpoint above returns informations about it.
However for newer books like: https://itunes.apple.com/lookup?isbn=9781419766954 https://itunes.apple.com/lookup?isbn=9781250288776
Nothing comes back anymore even if those books exist there. The url's for the 2 above are: https://books.apple.com/us/book/hot-mess-diary-of-a-wimpy-kid-19/id6476554491 https://books.apple.com/mt/book/the-mirror/id6474420363
For newer books starting the beginning of September 2024, nothing seems to come back when you search them by ISBN.
Thanks