> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://ixopay.ferndocs.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://ixopay.ferndocs.com/_mcp/server.

# Advanced guides

Welcome to our collection of advanced guides for 3-D Secure integration. In this section, you'll find specialized articles that delve deeper into the intricacies of 3-D Secure implementation. These guides are designed to provide you with in-depth insights and solutions for optimizing your 3-D Secure integration, ensuring secure and seamless payment experiences for your customers.

> **Guide**
>
> For a detailed, step-by-step guide on integrating 3-D secure, refer to the [3-D secure guide](https://documentation.ixopay.com/docs/guides/features/3d-secure "3-D secure guide") in our guides section.

## Articles

Explore the following advanced guides to gain a deeper understanding of 3-D Secure integration:

#### [Display the challenge flow in an iframe](https://documentation.ixopay.com/docs/reference/features/3d-secure/advanced-guides/challenge-flow-iframe)

How to embed the 3-D Secure challenge UI in an iframe — as a modal or inline element — and signal completion via postMessage to your payment page.