There is an error that says “Check required product info: [Cannot find legally required product info in the [Detail Info] of the entered category]”.

The error occurs when legally required information of a product was not put in correctly.

You have to enter notices parameter value correctly among JSON message.

1.Check the info entering the category code you want in the "displayCategoryCode" using [Category Meta Information Query API] .
2. In the "noticeCategories", select a most appropriate "noticeCategoryName". 
3. Please input all the "noticeCategoryDetailName" included in the "noticeCategoryName" in the json message.