I created an API that returns a list of items containing a specified IIIF manifest in Cultural Japan.
The API documentation is available at the following link.
https://petstore.swagger.io/?url=https://api.cultural.jp/v3/api-docs
Here is an example request.
For the API development, I used express-openapi and deployed it using AWS Lambda, referencing the following article.
https://www.forcia.com/blog/002471.html
I hope this serves as a useful reference for utilizing Cultural Japan.