> For the complete documentation index, see [llms.txt](https://developer.convergegate.com/legacy/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.convergegate.com/legacy/card-server-to-server/overview/process-flow.md).

# Process Flow

This sequence diagram illustrates the payment flow process involving a customer, merchant, Converge Gate, 3D Secure system, acquirer, and issuer. It shows the interactions and steps required to process a payment, including authentication and transaction result handling.

<div data-full-width="false"><figure><img src="/files/lfiVNzLptDGcU7DCkjas" alt=""><figcaption></figcaption></figure></div>

\*<mark style="color:orange;">These are conditional and will only be trigger if Auth type was Auth3DS or 3DS and card is enrolled in 3D</mark>