import requests

url = "https://{FUSION HOST}/api/experiments"

payload = {
    "id": "sample-experiment",
    "uniqueIdParameter": "userId",
    "baseSignalsCollection": "bestbuy",
    "variants": [
        { "name": "control-a1" },
        { "name": "control-a2" },
        {
            "name": "b",
            "queryPipeline": "with-recommendations"
        }
    ],
    "enabled": True,
    "metrics": [
        {
            "type": "ctr",
            "name": "CTR",
            "primary": True
        },
        {
            "type": "conversion-rate",
            "name": "purchase rate",
            "signalType": "purchase"
        }
    ]
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "id": "<string>",
  "description": "<string>",
  "uniqueIdParameter": "<string>",
  "baseSignalsCollection": "<string>",
  "variants": [
    {
      "id": "<string>",
      "name": "<string>",
      "collection": "<string>",
      "queryPipeline": "<string>",
      "params": [
        {
          "key": "<string>",
          "value": "<string>",
          "policy": "replace"
        }
      ],
      "weight": 123
    }
  ],
  "automaticallyAdjustTraffic": true,
  "enabled": true,
  "startTimestamp": "2023-11-07T05:31:56Z",
  "runId": "<string>",
  "metrics": [
    {
      "type": "<string>",
      "name": "<string>",
      "description": "<string>",
      "jobId": "<string>",
      "binary": true,
      "primary": true
    }
  ]
}