Invoices

External read API for billing invoices and invoice PDFs.

Invoices

Prefix: /api/v1/external/invoices

See Overview for authentication, pagination, and errors.

Read-only access to billing Invoice records (header plus line items) and the stored invoice PDF. Invoices are produced by billing runs; this API does not create or edit them.

Picklists (invoiceStatus, invoiceType, paymentStatus, approvalStatus, and similar) and currency are returned as names / ISO codes, not UUIDs.

Endpoint summary

Method	Path
GET	`/invoices`
GET	`/invoices/{invoiceId}`
GET	`/invoices/{invoiceId}/pdf`

List invoices

GET /api/v1/external/invoices?page=0&size=20&q=INV-10&accountId=11111111-1111-1111-1111-111111111111&fromDate=2026-08-01&toDate=2026-08-31
Authorization: Bearer YOUR_API_TOKEN

Query	Description
`page`	0-based page index (default `0`)
`size`	Page size (default 20, max 20)
`q`	Optional search on `invoiceNo`
`accountId`	Optional billing account UUID
`fromDate`	Optional inclusive start of invoice date (`YYYY-MM-DD`)
`toDate`	Optional inclusive end of invoice date (`YYYY-MM-DD`)

Either date bound may be omitted. If both are sent, fromDate must be on or before toDate (400 otherwise). List rows are invoice headers only (no items). Envelope: Overview.

Response 200

{
  "requestId": "req-1",
  "success": true,
  "status": 200,
  "errors": [],
  "data": {
    "content": [
      {
        "__type__": "Invoice",
        "Id": "55555555-5555-5555-5555-555555555555",
        "InvoiceNo": "INV-1001",
        "AccountId": "11111111-1111-1111-1111-111111111111",
        "ApprovalStatus": "fe07e71d-cba4-4316-9c7c-4935c3adec34",
        "ApprovalStatus__r": { "Name": "Approved" }
      }
    ],
    "totalElements": 1,
    "size": 20,
    "number": 0
  }
}

Response 400 when the date range is inverted.

{
  "status": 400,
  "error": "Validation Error",
  "message": "fromDate must be on or before toDate",
  "path": "uri=/api/v1/external/invoices"
}

Get invoice

GET /api/v1/external/invoices/{invoiceId}
Authorization: Bearer YOUR_API_TOKEN

Returns the same PascalCase + __r header row as list (no nested items).

Response 200

{
  "id": "55555555-5555-5555-5555-555555555555",
  "invoiceNo": "INV-1001",
  "invoiceDate": "2026-08-01",
  "accountId": "11111111-1111-1111-1111-111111111111",
  "invoiceStatus": "Posted",
  "invoiceType": "Generated",
  "amount": 40.0,
  "taxAmount": 4.0,
  "balance": 44.0,
  "currency": "USD",
  "dueDate": "2026-08-31",
  "periodStart": "2026-08-01",
  "periodEnd": "2026-08-31",
  "paymentStatus": "Unpaid",
  "approvalStatus": "Approved",
  "contractId": "3a2f1c5d-9b7e-4c1a-8f36-2d4b6e8a0c11",
  "invoiceFileName": "INV-1001.pdf",
  "items": [
    {
      "id": "66666666-6666-6666-6666-666666666666",
      "invoiceId": "55555555-5555-5555-5555-555555555555",
      "serviceId": "e6cbd28a-f34c-482e-8da5-34e21dbd5eb7",
      "description": "Usage",
      "volume": 16000,
      "ratePerUnit": 0.0025,
      "amount": 40.0,
      "tax": 4.0,
      "balance": 44.0,
      "chargeType": "Usage",
      "priceMethodType": "QUANTITY",
      "billStartDate": "2026-08-01",
      "billEndDate": "2026-08-31",
      "serviceName": "gpt-4o",
      "serviceCode": "MODEL-GPT-4O",
      "currency": "USD"
    }
  ]
}

Response 404 when the invoice does not exist.

{
  "status": 404,
  "error": "Not Found",
  "message": "Invoice not found",
  "path": "uri=/api/v1/external/invoices/55555555-5555-5555-5555-555555555555"
}

Download invoice PDF

GET /api/v1/external/invoices/{invoiceId}/pdf
Authorization: Bearer YOUR_API_TOKEN

curl -sS -L \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -o INV-1001.pdf \
  "https://YOUR_TENANT_HOST/api/v1/external/invoices/55555555-5555-5555-5555-555555555555/pdf"

Response 200 — binary body with PDF headers.

HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Disposition: attachment; filename="INV-1001.pdf"

The PDF is the file already stored for that invoice (from invoice PDF generation).

Response 404 when no PDF has been generated yet.

{
  "status": 404,
  "error": "Not Found",
  "message": "Invoice PDF has not been generated",
  "path": "uri=/api/v1/external/invoices/55555555-5555-5555-5555-555555555555/pdf"
}

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