curl --request GET \
  --url https://api.natural.co/agents/{agentId}/customers \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "type": "customer",
      "id": "pty_4a8c9823f39c42a5b817556766551112",
      "attributes": {
        "name": "Acme Co",
        "email": "ops@example.com",
        "status": "ACTIVE",
        "permissions": [
          "payments.create",
          "payments.read"
        ],
        "limits": {
          "perTransaction": 100000
        },
        "createdAt": "2026-01-11T12:00:00.000Z",
        "updatedAt": "2026-01-11T12:00:00.000Z"
      },
      "relationships": {
        "agent": {
          "data": {
            "type": "agent",
            "id": "agt_3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f",
            "attributes": {
              "name": "Carrier Payment Agent"
            }
          }
        }
      }
    }
  ],
  "meta": {
    "pagination": {
      "hasMore": false,
      "nextCursor": null
    }
  }
}