curl --request POST \
  --url https://app.azalt.co/api/v1/activities \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "formId": "<string>",
  "key": "<string>",
  "siteId": "<string>",
  "year": 123,
  "periodUnit": 123,
  "input": {}
}
'

{
  "id": "<string>",
  "formSubmissionId": "<string>",
  "formElementId": "<string>",
  "periodUnit": 123,
  "sequence": 123,
  "activity": {
    "activityId": "<string>",
    "input": {},
    "value": 123,
    "metadata": {}
  },
  "value": "<unknown>"
}