import requests

url = "https://{FUSION HOST}/async-parsing/failed-datasource/{datasourceId}/id/{id}"

response = requests.get(url)

print(response.text)

{
  "id": "<string>",
  "datasourceId": "<string>",
  "documentId": "<string>",
  "jobRunId": "<string>",
  "collectionId": "<string>",
  "pipelineId": "<string>",
  "connectorType": "<string>",
  "failures": 123,
  "contentType": "<string>",
  "metadata": {},
  "requestHeaders": {},
  "optionalContentType": "<string>"
}