curl --request POST \
  --url https://sdk-api.playcamp.io/v1/server/sponsors \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "userId": "<string>",
  "creatorKey": "<string>",
  "campaignId": "<string>",
  "callbackId": "<string>",
  "isTest": false
}
'

{
  "data": {
    "userId": "<string>",
    "campaignId": "<string>",
    "creatorKey": "<string>",
    "isActive": true,
    "sponsoredAt": "2023-11-07T05:31:56Z"
  }
}