curl --request POST \
  --url https://api.clinikapi.com/v1/activity-definitions \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "<string>",
  "title": "<string>",
  "description": "<string>",
  "purpose": "<string>",
  "usage": "<string>",
  "kind": "<string>",
  "code": "<string>",
  "doNotPerform": true,
  "timingDateTime": "<string>",
  "timingPeriod": {
    "start": "<string>",
    "end": "<string>"
  },
  "locationId": "<string>",
  "participant": [
    {
      "type": "<string>",
      "role": "<string>"
    }
  ],
  "quantity": {
    "value": 123,
    "unit": "<string>"
  },
  "bodySite": [
    "<string>"
  ],
  "publisher": "<string>",
  "date": "<string>",
  "version": "<string>",
  "url": "<string>",
  "experimental": true,
  "topic": [
    "<string>"
  ]
}
'