> 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="https://2216087362-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcgiccOa8NcM1f9nfS5LN%2Fuploads%2FsY3wdOYbdoMiaa8h5ltQ%2FConverge%20Gate%20diagram.png?alt=media&amp;token=641ae8a4-1cf4-47aa-a333-6bac6fadafdd" 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>