curl --request POST \
  --url https://api.unprice.dev/v1/customer/reportUsage \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "customerId": "cus_1H7KQFLr7RepUyQBKdnvY",
  "featureSlug": "tokens",
  "usage": 30,
  "idempotenceKey": "123e4567-e89b-12d3-a456-426614174000",
  "metadata": {
    "action": "create",
    "country": "US"
  }
}'

{
  "success": true,
  "message": "<string>",
  "cacheHit": true,
  "remaining": 123
}