import requests

url = "https://{FUSION HOST}/api/index-stages/schema/{type}"

headers = {"Authorization": "Basic <encoded-value>"}

response = requests.get(url, headers=headers)

print(response.json())

{
  "type": "object",
  "title": "Regex Field Extraction",
  "description": "This stage allows you to extract entities using regular expressions",
  "properties": {
    "rules": {
      "type": "array",
      "title": "Regex Rules",
      "items": {
        "type": "object",
        "required": [
          "pattern"
        ],
        "properties": {
          "source": {
            "type": "array",
            "title": "Source Fields",
            "items": {
              "type": "string"
            }
          },
          "target": {
            "type": "string",
            "title": "Target Field"
          },
          "pattern": {
            "type": "string",
            "title": "Regex Pattern",
            "format": "regex"
          },
          "annotateAs": {
            "type": "string",
            "title": "Annotation Name"
          }
        }
      }
    }
  }
}