curl --request GET \
  --url https://sdk-api.playcamp.io/v1/server/sponsors/user/{userId} \
  --header 'Authorization: Bearer <token>'

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