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

{
  "data": {
    "id": 123,
    "transactionId": "<string>",
    "userId": "<string>",
    "productId": "<string>",
    "productName": "<string>",
    "amount": 123,
    "currency": "<string>",
    "amountUsd": 123,
    "campaignId": "<string>",
    "creatorKey": "<string>",
    "purchasedAt": "2023-11-07T05:31:56Z",
    "createdAt": "2023-11-07T05:31:56Z"
  }
}