# KSeF FA(3) e-invoice validator

**Use case:** 

Checks Polish structured invoices against the official KSeF FA(3) schema before you upload them to the National e-Invoicing System. You get a verdict per document and every schema error with its line and message. Validate one invoice or a whole batch of URLs, and share the result as an HTML report.

## Input

```json
{
  "startUrls": [
    {
      "url": "https://xmlvalid.com/schemas/ksef-fa-3/example"
    }
  ],
  "schema": "auto",
  "maxErrors": 20,
  "shareReport": false,
  "concurrency": 3
}
```

## Output

```json
{
  "source": {
    "label": "Document",
    "format": "link"
  },
  "valid": {
    "label": "Valid",
    "format": "boolean"
  },
  "outcome": {
    "label": "Outcome",
    "format": "text"
  },
  "schema": {
    "label": "Schema",
    "format": "text"
  },
  "errorsTotal": {
    "label": "Errors",
    "format": "number"
  },
  "warningsTotal": {
    "label": "Warnings",
    "format": "number"
  },
  "firstError": {
    "label": "First error",
    "format": "text"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The XML & E-invoice Validator (XSD, Peppol, XRechnung, Factur-X) Actor is ready to run with the inputs already set for "KSeF FA(3) e-invoice validator". [Sign up or log in](https://console.apify.com/create-task-from-example/yQdFEubMvNUEEUlTh) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "KSeF FA(3) e-invoice validator" task

The XML & E-invoice Validator (XSD, Peppol, XRechnung, Factur-X) Actor will start running based on the input automatically. You can also change all the input fields, like document urls, schema, and more, to match your specific use case.

### 3. Receive the "KSeF FA(3) e-invoice validator" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as document, valid, outcome, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "KSeF FA(3) e-invoice validator" task via API](https://apify.com/xmlvalid/xml-einvoice-validator.md).

## About this Actor

This example demonstrates how to use [XML & E-invoice Validator (XSD, Peppol, XRechnung, Factur-X)](https://apify.com/xmlvalid/xml-einvoice-validator.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/xmlvalid/xml-einvoice-validator.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/xmlvalid/xml-einvoice-validator.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).