Get usage by meter

curl --request POST \
  --url https://api.cloud.flexprice.io/v1/events/usage/meter \
  --header 'Content-Type: */*' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "customer_id": "customer456",
  "end_time": "2024-12-09T00:00:00Z",
  "external_customer_id": "user_5",
  "filters": {},
  "meter_id": "123",
  "start_time": "2024-11-09T00:00:00Z",
  "window_size": "MINUTE"
}'

{
  "event_name": "<string>",
  "results": [
    {
      "value": 123,
      "window_size": "<string>"
    }
  ],
  "type": "COUNT",
  "value": 123
}