curl --request GET \
  --url https://api.upwell.com/api/rest/invoices/queues/ready-for-approval

{
  "invoices": [
    {
      "approvedToSend": true,
      "createdAt": "2023-11-07T05:31:56Z",
      "customer": {
        "id": "<string>",
        "name": "<string>"
      },
      "customerId": "<string>",
      "id": "<string>",
      "issueDate": "2023-12-25",
      "number": "<string>",
      "totalAmount": 123
    }
  ],
  "invoicesAggregate": {
    "aggregate": {
      "count": 123
    }
  }
}