The Invoice4U API lets you create tax-compliant documents (invoices, receipts, credit invoices and more), manage customers and branches, and charge credit cards through the Invoice4U clearing service — all from your own application.
Use it to automate billing flows, sync your CRM or e-commerce store with Invoice4U, and collect payments with hosted clearing pages, saved card tokens, or standing orders.
The clearing service supports four providers — UPay, Meshulam, YaadSarig and Cardcom (ClearingCompanies values 6, 7, 12, 15); the one configured on your account is used automatically. See the clearing overview.
Create an account at invoice4u.co.il.
Enable API access for your organization (Settings → API, or contact support).
Authenticate with your credentials or API key and use the returned token in your API requests.
Production
https://api.invoice4u.co.il/Services/ApiService.svc
QA (staging)
https://apiqa.invoice4u.co.il/Services/ApiService.svc
All endpoints in this documentation are relative to these base URLs. Develop and test against QA first, then switch the base URL to Production.
The API is a WCF service exposed over REST (JSON). A SOAP endpoint is also available at {baseUrl}/Soap (basicHttpBinding) for legacy integrations, but REST/JSON is the recommended and documented surface.
Unless stated otherwise, endpoints are called with POST and a JSON body that wraps the operation parameters by name (WCF "wrapped request" style):
POST /Services/ApiService.svc/CreateDocument HTTP/1.1
Host: api.invoice4u.co.il
Content-Type: application/json
{
"doc": { ... },
"token": "<your-token>"
}Almost every endpoint takes a token parameter — this is your organization API key (GUID), passed in the body of each call. See Authentication Overview.
Most response objects inherit a common envelope. Always check Errors before using the payload:
Errors
array
List of errors. Empty on success. Each item: ID (numeric error code), Error (error name), Paramters (optional context, e.g. row number).
Info
array
Informational messages (e.g. SuccessfulAction).
OpenInfo
object
Key/value extras returned by some endpoints (e.g. PaymentMismatchDelta).
Follow the Quick Start, then read Key Tips & Differences (also available in Hebrew).
OpenAPI 3.0 spec (JSON) — the full API surface for code generators, Postman, and AI agents.
Postman collection — ready-made requests for every documented endpoint.
AI agents: this site serves llms.txt, and every page is available as Markdown by appending .md to its URL.
For integration help, contact Invoice4U support through your account. Include the endpoint called, the request payload, the response payload, and the environment (QA/Production) with every report.
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