Do I need API keys for QuickBooks, Stripe, or Xero to use this API?

No. You only need your RapidAPI key. You obtain invoice JSON through your own integrations and POST it here; this service does not call vendor APIs.

What is the maximum request size?

15MB per JSON body. Oversized bodies return HTTP 413 with PAYLOAD_TOO_LARGE.

Does it store or log my invoice data?

No. Processing is stateless and in-memory; payloads are not persisted for this service.

Can I auto-detect the vendor from the payload?

Yes. Omit the source field when the shape is recognizable; the response can include detectedSource.

What is generic normalization?

For unknown or generic JSON, heuristics such as webhook unwrapping, stripe_like, csv_like, erp_export, pdf_extract, or invoice_shaped are used. sourceMeta.genericMode records the mode; confidence is often lower than named vendors.

Does this API perform OCR on PDFs or images?

No OCR is performed here. Send structured JSON from your own OCR or extraction pipeline, often with source generic.

Where are pricing and quotas defined?

On RapidAPI: Basic is free with 100 requests per month; Pro is $9.99/month with 10,000; Ultra is $49.99/month (popular) with 100,000; Mega is $99.99/month with 250,000. Overage is on the live listing.

What must the JSON body include?

A top-level payload object with the raw vendor invoice JSON. source is optional. Missing payload returns 400 INVALID_REQUEST.

One Canonical Invoice for QuickBooks, Stripe, Xero, Shopify, and 40+ Sources

POST a JSON body with required payload (raw vendor invoice object) and optional source (e.g. stripe, quickbooks, xero, generic). Omit source for auto-detect. The API returns a single normalized invoice: invoiceId, ISO dates, currency, amounts in major units, lineItems, customer, vendor, confidence, normalizationWarnings, and detectedSource when inferred. No fetching of vendor APIs—15MB max, stateless.

Try Invoice Normalization Basic on RapidAPI: 100 requests/month free

Stop reimplementing cents-to-dollars, nested line arrays, and DocNumber vs id for every integration. One response shape feeds ERP sync, expense review, webhooks, and warehouse loads—use confidence and normalizationWarnings to route edge cases.

Real-world use cases

Multi-ledger accounting sync — Normalize QuickBooks, Xero, and Stripe before one ERP import.
Spend management — Unify Expensify, Brex, and Concur-style payloads for approval flows.
Payment webhooks — Turn Stripe, PayPal, or Adyen event bodies into comparable totals and lines.
Marketplace reconciliation — One schema for Amazon Seller, eBay, Etsy, Walmart payloads.
Post-OCR pipelines — Send extraction JSON with source: "generic"; check sourceMeta.genericMode.

Why not map every vendor in your codebase?

Amount units and tax handling differ by API
Line items hide under different keys (lines.data, Line, line_items)
Each new vendor duplicates tests and edge-case risk

Who this API helps

Accounting and ERP integrators
Expense and corporate card platforms
Payment and subscription products
E-commerce and marketplace ops
Data engineers loading financial JSON

Before and after

Vendor fragment (Stripe-style)

amount_due: 10000, lines.data[]

Canonical (fragment)

total: 100,
lineItems: [{ lineTotal: 100 }],
currency: "USD",
confidence: 0.95

What the API does

POST /normalize — Content-Type: application/json. Body must include payload (object). Optional source string selects or hints the normalizer.

GET /health — { "status": "ok" }.

The service does not connect to QuickBooks, Stripe, or other vendors; it only interprets the JSON you send.

Deterministic output

The same request body yields the same normalized invoice—suitable for fixtures and regression tests.

Request & response

Endpoint: POST https://financial-invoice-normalization.p.rapidapi.com/normalize with x-rapidapi-key and x-rapidapi-host: financial-invoice-normalization.p.rapidapi.com (verify in your RapidAPI app).

View request fields · View response fields · View HTTP errors

Field	Required	Description
`payload`	Yes	Raw invoice/receipt JSON from the vendor or your extractor.
`source`	No	Explicit normalizer: quickbooks, stripe, xero, shopify, paypal, adyen, paddle, zoho_books, freshbooks, expensify, brex, amazon_seller, ebay, etsy, walmart_marketplace, generic, etc. Omit for auto-detect.

Field	Description
`invoiceId`	Identifier when available.
`source`	Normalizer used.
`sourceMeta`	Metadata; `genericMode` when generic heuristics apply.
`issueDate`, `dueDate`	ISO 8601 or null.
`currency`	ISO 4217 uppercase.
`status`	Normalized status string or null.
`customer`, `vendor`	Structured parties.
`subtotal`, `taxTotal`, `discountTotal`, `total`	Major units.
`lineItems`	Canonical lines with description, quantity, amounts.
`confidence`	0–1.
`normalizationWarnings`	Human-readable inference notes.
`detectedSource`	Set when `source` was omitted and a vendor was inferred.

HTTP	`error`	Meaning
400	`INVALID_REQUEST`	Missing `payload` or invalid body.
400	`INVALID_JSON`	Body is not valid JSON.
413	`PAYLOAD_TOO_LARGE`	Serialized body exceeds 15MB.
500	`INTERNAL_ERROR`	Unexpected server error.

Try it in the playground

Pick a sample or paste JSON, add your RapidAPI key, run, then copy generated code.

RapidAPI Key (required)

Sample request

Templates load into the editor; edit before running.

Request body (JSON)

Subscribe on RapidAPI for production quotas.

Get code

Snippets reflect the playground. Path: /normalize.

Integration time: Any stack that can POST JSON with RapidAPI headers.

Real-world examples

1. ERP ingest loop

For each vendor file or API response, POST { source, payload } and upsert the canonical fields into your ledger tables.

2. Webhook fan-in

Forward payment-provider webhook JSON as payload without source when shapes vary; inspect detectedSource and confidence before automation.

3. Human review queue

If confidence < 0.7 or normalizationWarnings.length is high, route to analysts; otherwise auto-post.

Pricing & tiers (RapidAPI)

Built for teams that normalize high volumes of heterogeneous invoice JSON.

Plans on RapidAPI:

Basic

$0/mo

100 requests/month included

Pro

$9.99/mo

10,000 requests/month included

Popular

Ultra

$49.99/mo

100,000 requests/month included

Mega

$99.99/mo

250,000 requests/month included

Overage and plan changes follow the live RapidAPI listing.

What to expect

Successful normalization returns HTTP 200 with one invoice object. Validation failures return 400; oversized JSON 413; rare faults 500.

About this API

Also known as

Invoice normalization API, receipt normalizer, multi-vendor invoice parser, financial data normalization.

Covers accounting suites, PSPs, marketplaces, POS, and expense tools—see the README on GitHub or RapidAPI for the full vendor table and generic mode reference.

Frequently asked questions

No—only RapidAPI. You fetch invoice JSON with your own integrations and send it as payload.
15MB per JSON body.
No. Stateless processing; not persisted by this API.
Yes. Omit source when the payload shape is recognizable; check detectedSource in the response.
Heuristic modes (webhook, stripe_like, csv_like, erp_export, pdf_extract, invoice_shaped) with sourceMeta.genericMode; confidence is often lower than named vendors.
No. Pass structured JSON from your OCR pipeline, often with source generic.
On RapidAPI: Basic 100/mo; Pro $9.99/10k; Ultra $49.99/100k (popular); Mega $99.99/250k.
A top-level payload object. source is optional.

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