How can get Zoho Books field API names

How can get Zoho Books field API names

I want to get Zoho Books, Inventory field API names like Zoho CRM. How can get?? See example for CRM

URL: https://www.zohoapis.com/crm/v2/settings/fields?module={module_api_name}

Method: GET

Header: Authorization=Zoho-oauthtoken {oauth_token}