curl --request GET \
  --url https://api-m.sandbox.paypal.com/v1/commerce/billing/customers/{external_customer_id}/analytics/gross-revenue \
  --header 'Authorization: Bearer <token>'

{
  "gross_revenues": [
    {
      "month": "2023-11",
      "amount": {
        "value": 120.35,
        "currency_code": "USD"
      },
      "invoices_count": 10
    }
  ]
}

{
  "name": "INVALID_REQUEST",
  "message": "Request is not well-formed, syntactically incorrect, or violates schema.",
  "debug_id": "dc99e3955cdd8",
  "details": [
    {
      "field": "/email",
      "value": "abc",
      "location": "body",
      "issue": "INVALID_PARAMETER_VALUE",
      "description": "The value of a field does not conform to the expected format."
    }
  ]
}

{
  "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"
}