import requests

url = "https://{FUSION HOST}/api/custom-rule-types"

payload = {
    "id": "<string>",
    "display_type": "<string>",
    "pipeline_id": "<string>",
    "schema": {}
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())

{
  "id": "<string>",
  "display_type": "<string>",
  "pipeline_id": "<string>",
  "schema": {}
}