# Create book URL: https://docs.hanzo.ai/docs/openapi/books/post-books-scan-book > Posts a reviewed scanned bill to the ledger. `POST /v1/books/scan/book` > [Books →](https://docs.hanzo.ai/docs/openapi/books) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides) | | | | ------------- | ----------------------------------------- | | **Address** | `https://api.hanzo.ai/v1/books/scan/book` | | **Method** | `POST` | | **Operation** | `post_books_scan_book` | | **Auth** | `Authorization: Bearer $HANZO_API_KEY` | Posts a reviewed scanned bill to the ledger. It is the scanner's ONLY write: the voucher goes through the same post() choke point every other source uses, so it is checked to balance (Σdebit == Σcredit) and is idempotent by (scan, scanId) — re-booking the same scan answers posted=false and writes nothing. A bill whose economic identity (vendor, total, issue date) already posted under a DIFFERENT scan is refused 409 unless override is set, which is what stops the same receipt re-scanned into a new file hash from double-booking. An unbalanced voucher is refused 400. ## Request 11 fields, body `application/json` (required). | Field | In | Type | Required | Description | | ------------------------ | ---- | --------------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `override` | body | boolean | — | Override books this bill even when one of the SAME economic identity (vendor, total, issue date) already posted — the explicit human confirmation that a same-looking bill is a genuine second spend, not the same receipt re-scanned. | | `scanId` | body | string | — | ScanID is the scanned document's file hash, as GET /v1/books/inbox and the scan draft report it. | | `voucher` | body | books.Voucher | — | | | `voucher.description` | body | string | — | Description is the human line for the event, e.g. the vendor a bill came from. | | `voucher.legs` | body | books.Leg\[] | — | Legs are the sides of the posting. | | `voucher.legs[].account` | body | string | — | Account is the chart-of-accounts number this side posts to, e.g. "5300". | | `voucher.legs[].credit` | body | integer (int64) | — | Credit is the leg's credit in exact cents. | | `voucher.legs[].debit` | body | integer (int64) | — | Debit is the leg's debit in exact cents. | | `voucher.postingAt` | body | string | — | PostingAt is the RFC3339 instant the event posts at — the time every statement window filters on. | | `voucher.sourceId` | body | string | — | SourceID is the source event's own id within that namespace. | | `voucher.sourceKind` | body | string | — | SourceKind is the idempotency namespace naming what booked this, e.g. "scan". | ## Response | Status | Body | Meaning | | --------- | ------------------ | ------- | | `200` | books.BookResponse | ok | | `default` | problem-details | refused | `200` body — 2 fields. | Field | In | Type | Always | Description | | -------- | ---- | ------- | ------ | --------------------------------------------------------------------------------------------------------------------- | | `posted` | body | boolean | — | Posted is true when this call wrote the voucher, false when the same scan had already booked and nothing was written. | | `scanId` | body | string | — | ScanID echoes the scan that was booked. | Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors). ## Examples **CLI** ```bash hanzo books scan book ``` **SDK** **.ts** ```ts import { Configuration, BooksApi } from 'hanzoai'; const api = new BooksApi(new Configuration({ accessToken: process.env.HANZO_API_KEY })); const { data } = await api.postBooksScanBook({ override: false, scanId: "" }); ``` **.py** ```python from hanzoai.cloud import ApiClient, Configuration from hanzoai.cloud.api import BooksApi client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"])) result = BooksApi(client).post_books_scan_book(override=False, scan_id="") ``` **.go** ```go cfg := hanzoai.NewConfiguration() cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY")) client := hanzoai.NewAPIClient(cfg) resp, _, err := client.BooksAPI.PostBooksScanBook(context.Background()).Execute() if err != nil { return err } ``` **.rs** ```rust use hanzo_client::apis::{configuration::Configuration, books_api}; let mut cfg = Configuration::new(); cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok(); let result = books_api::post_books_scan_book(&cfg, Default::default()).await?; ``` **.java** ```java import ai.hanzo.cloud.ApiClient; import ai.hanzo.cloud.api.BooksApi; ApiClient client = new ApiClient(); client.setBearerToken(System.getenv("HANZO_API_KEY")); var result = new BooksApi(client).postBooksScanBook(); ``` **HTTP** ```bash curl -X POST https://api.hanzo.ai/v1/books/scan/book \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "override": false, "scanId": "" }' ``` **MCP** MCP reaches **books** through the `books` tool, which names its 20 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them: ```bash curl -X POST https://api.hanzo.ai/v1/mcp \ -H "Content-Type: application/json" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "describe", "arguments": { "op": "list_book_accounts" } } }' ``` --- [Books API](https://docs.hanzo.ai/docs/openapi/books) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)