import requests

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

payload = {
    "createdAt": "2023-11-07T05:31:56Z",
    "searchClusterId": "<string>",
    "commitWithin": 10000,
    "features": {},
    "compositeIdSpec": {
        "routeKey1Field": "<string>",
        "routeKey1Bits": 123,
        "routeKey2Field": "<string>",
        "routeKey2Bits": 123
    },
    "solrParams": {
        "name": "<string>",
        "numShards": 123,
        "replicationFactor": 123,
        "collection.configName": "<string>"
    },
    "modifiedAt": "2023-11-07T05:31:56Z",
    "type": "DATA",
    "relatedCollectionId": "<string>",
    "metadata": {}
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

{
  "id": "newCollection",
  "createdAt": "2014-09-19T18:46:52.954Z",
  "searchClusterId": "default",
  "solrParams": {
    "name": "newCollection",
    "numShards": 1,
    "replicationFactor": 1
  },
  "type": "DATA",
  "metadata": {}
}