Number of APIs: 2
1. Get list of categories by parent ID and level
GET {{baseUrl}}/categories/parent/:parent/level/:level
Service urls:
http://yourdomain.com/api/rest/categories/parent/{parent_id}/level/{level}
OR
http://yourdomain.com/index.php?route=feed/rest_api/categories&parent={parent_id}&level={level}
2. Get list of categories by parent ID
GET {{baseUrl}}/categories/parent/:parent
Service urls:
http://yourdomain.com/api/rest/categories/parent/{parent_id}
OR
http://yourdomain.com/index.php?route=feed/rest_api/categories%26parent={parent_id}
ENDPOINTS