curl --request GET \
  --url https://api.unprice.dev/v1/customer/{customerId}/getUsage \
  --header 'Authorization: Bearer <token>'

{
  "planName": "<string>",
  "billingPeriod": "<string>",
  "billingPeriodLabel": "<string>",
  "currency": "<string>",
  "groups": [
    {
      "id": "<string>",
      "name": "<string>",
      "featureCount": 123,
      "features": [
        {
          "id": "<string>",
          "name": "<string>",
          "type": "flat",
          "typeLabel": "<string>",
          "currency": "<string>",
          "price": "<string>",
          "enabled": true,
          "billing": {
            "billingFrequencyLabel": "<string>",
            "resetFrequencyLabel": "<string>"
          },
          "description": "<string>"
        }
      ]
    }
  ],
  "priceSummary": {
    "totalPrice": "<string>",
    "flatTotal": "<string>",
    "tieredTotal": "<string>",
    "packageTotal": "<string>",
    "usageTotal": "<string>"
  },
  "planDescription": "<string>",
  "renewalDate": "<string>",
  "daysRemaining": 123
}