import requests

url = "https://{FUSION HOST}/api/parsers/{id}/parse"

payload = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"offset\"\r\n\r\n123\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"limit\"\r\n\r\n123\r\n-----011000010111000001101001--"
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "multipart/form-data; boundary=---011000010111000001101001"
}

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

print(response.text)

{
  "diagnostics": [
    {
      "cause": "<string>",
      "code": 123,
      "diagnosticId": "<string>",
      "filter": "<string>",
      "parserStageId": "<string>",
      "parserStageType": "<string>",
      "result": true
    }
  ],
  "documents": [
    {
      "id": "<string>",
      "fields": [
        {
          "name": "<string>",
          "value": {},
          "metadata": {},
          "annotations": [
            {
              "type": "<string>",
              "start": 123,
              "end": 123,
              "features": {},
              "label": "<string>",
              "featureCount": 123
            }
          ]
        }
      ],
      "metadata": {},
      "commands": [
        {
          "name": "<string>",
          "params": {}
        }
      ],
      "hints": {}
    }
  ],
  "errors": [
    {
      "context": {},
      "message": "<string>"
    }
  ],
  "parsedStreams": 123,
  "totalDocuments": 123,
  "totalTimeMs": 123
}