---
title: Introducing Session ID to StartPaymentSession - Shopify developer changelog
description: Shopify’s developer changelog documents all changes to Shopify’s platform. Find the latest news and learn about new platform opportunities.
source_url:
  html: https://shopify.dev/changelog/introducing-session-id-to-startpaymentsession
  md: https://shopify.dev/changelog/introducing-session-id-to-startpaymentsession.md
---

[Back to Developer changelog](https://shopify.dev/changelog)

October 1, 2024

Tags:

* Payments Apps API
* 2024-10

# Introducing Session ID to StartPaymentSession

As of Payments Apps API version 2024-10, the StartPaymentSession payload for all payment extension types will have one new field: [session\_id](https://shopify.dev/docs/apps/build/payments/request-reference#request-body).

This identifier is shared across payment sessions that belong to the same payment group, buyer session, and share payment details. It can be used to power auth rate calculations.