> Portal Navigation:
> 
> - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version.
> - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages).
> - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`).
> - Top-level index of all portals: https://dev.wix.com/docs/llms.txt
> - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt

## Resource: Introduction

## Article: Introduction

## Article Link: https://dev.wix.com/docs/api-reference/business-management/captcha/introduction.md

## Article Content:

# Introduction

> **Note**: If you're working in [Wix Headless](https://dev.wix.com/docs/go-headless.md) or using our [REST APIs](https://dev.wix.com/docs/rest.md), you can't use this API.

The CAPTCHA API lets you authorize a generated CAPTCHA token in your backend code. The API provides an `Authorize` method that accepts and validates tokens. Call `Authorize` in your backend code before executing any restricted operations.

The `Authorize` method works with the Wix [reCAPTCHA](https://dev.wix.com/docs/velo/velo-only-apis/$w/captcha/introduction.md#api-reference_$w_captcha_typical-captcha-validation-lifecycle) element. This frontend element creates a challenge-response authentication that verifies Wix site visitors are human, before allowing them to perform restricted operations. It generates a token when a site visitor successfully completes the challenge-response authentication.

If you're developing a Wix site or a Blocks app, you can [add the Wix reCAPTCHA element](https://support.wix.com/en/article/velo-tutorial-using-recaptcha-to-protect-data-submission) to the frontend of your site or app. You can then call `Authorize` in your backend.

@sdk_package_setup