curl --request GET \
  --url https://api-m.sandbox.paypal.com/v1/commerce/billing/subscriptions/{external_subscription_id}/lifetime-usage \
  --header 'Authorization: Bearer <token>'

{
  "external_subscription_id": "Subscription_External_1",
  "external_historical_usage_amount": {
    "value": 0,
    "currency_code": "USD"
  },
  "invoiced_usage_amount": {
    "value": 0,
    "currency_code": "USD"
  },
  "current_usage_amount": {
    "value": 0,
    "currency_code": "USD"
  },
  "from": "2025-07-31T12:59:15Z",
  "to": "2025-08-01T07:04:39Z"
}

{
  "name": "NOT_AUTHORIZED",
  "message": "Authorization failed due to insufficient permissions.",
  "debug_id": "565f78f101498",
  "details": [
    {
      "issue": "PERMISSION_DENIED",
      "description": "You do not have permission to access or perform operations on this resource."
    }
  ]
}

{
  "name": "<string>",
  "debug_id": "<string>",
  "message": "<string>",
  "details": [
    {
      "field": "<string>",
      "value": "<string>",
      "location": "<string>",
      "issue": "<string>",
      "description": "<string>"
    }
  ]
}

{
  "name": "INTERNAL_SERVER_ERROR",
  "message": "An internal server error has occurred.",
  "debug_id": "90957fca61718"
}