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

{
  "usage": [
    {
      "resourceSlug": "<string>",
      "resourceId": "<string>",
      "capacity": 0,
      "claimed": 0,
      "available": 0
    }
  ]
}