curl --location 'https://app.tangoagreements.com/api/1.1/wf/get_proposal' \
--header 'Authorization: Bearer {{api_token}}' \
--form 'proposal_id="123x456"'

{
  "url": "https://app.tangoagreements.com/agreement/123x456",
  "id": "123x456",
  "title": "Hello World!",
  "status": "Draft",
  "version": "001",
  "client_business_name": "My Client's Business Name",
  "users": [
    {
      "name": "John Doe",
      "email": "[email protected]",
      "role": "Owner"
    }
  ],
  "contract_terms": [
    {
      "name": "Tax",
      "description": "Additional % added to all costs",
      "tax": "GST",
      "value": 0.1
    },
    {
      "name": "Deposit terms",
      "description": "Days prior to the start date the first invoice must be paid",
      "value": 3
    },
    {
      "name": "Payment terms",
      "description": "Days after a due date an invoice is marked as overdue",
      "value": 14
    },
    {
      "name": "Late payment fee",
      "description": "Additional % you are liable to pay on an overdue invoice",
      "value": 0.1
    },
    {
      "name": "Review period",
      "description": "Days the client has to review work",
      "value": 5
    },
    {
      "name": "Location",
      "description": "Jurisdiction of contract (State and/or Country)",
      "value": "Queensland, Australia"
    }
  ],
  "invoices": [
    {
      "id": "123x456",
      "proposal": "123x456",
      "billed_from": "John's Development Business",
      "billed_to": "My Client's Business Name",
      "currency": "USD",
      "due_date": "2024-03-10T23:28:51.626Z",
      "invoice_number": "",
      "paid_date": null,
      "schedule_type": "on acceptance",
      "status": "Draft",
      "tax_name": "GST",
      "tax_percentage": 0.1,
      "total_excluding_tax": 500,
      "total": 550,
      "line_items": [
        {
          "description": "Hello World!: Instalment ",
          "amount_excluding_tax": 500,
          "tax_amount": 50,
          "total": 550
        }
      ]
    }
  ]
}