In the current system, the cooperation with external software relies on manual processes, which leads to a decrease in business efficiency. A lot of manual work is required to retrieve and update data, which is a waste of resources. 
I would like you to implement the RESTful API in the system. At a minimum, please provide a read-only API (GET function). If possible, I would appreciate it if you could include the following functions:
 – Data reading (GET)
 – Data creation (POST)
 – Data update (PUT)
 – Data deletion (DELETE)
 – Appropriate certification and approval mechanism
 – Support for JSON response format 
Thank you for your consideration.