curl --request GET \
  --url https://app.flowglad.com/api/v1/usage-events/{id} \
  --header 'Authorization: <api-key>'

{
  "usageEvent": {
    "id": "<string>",
    "createdAt": 0,
    "updatedAt": 0,
    "livemode": true,
    "customerId": "<string>",
    "subscriptionId": "<string>",
    "usageMeterId": "<string>",
    "billingPeriodId": "<string>",
    "amount": 123,
    "usageDate": 0,
    "transactionId": "<string>",
    "priceId": "<string>",
    "properties": {}
  }
}