In the Rakuten Ichiba API output results, only the information listed in the detailed pages below can be retrieved.
Therefore, it is not possible to obtain color or size.
However, the search criteria allows you to search by tag ID.
https://webservice.rakuten.co.jp/documentation/ichiba-item-search
Example)
If you want to specify the following to be acquired
Genre: Shoes
Size: 26.0cm (tagId=1000373)
Color: White (tagId=1000873)
When you specify a color or size on the web screen, a tagId is attached to the URL, such as tg1000873.
You can use the tagId you have looked up in this way for API searches as follows.
Web:
API:
https://app.rakuten.co.jp/services/api/IchibaItem/Search/20170706?format=json&genreId=558885&tagId=1000373,1000873&applicationId=Your app ID
Up to 10 tag IDs can be specified separated by commas (,).