---
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
metadata:
  effectiveApiVersion: 2024-10
  affectedApi:
    - displayName: Payments Apps API
      handle: payments-apps-api
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: New
    handle: new
  indicatesActionRequired: false
  createdAt: '2024-08-29T23:53:25-04:00'
  postedAt: '2024-10-01T09:00:00-04:00'
  updatedAt: '2024-10-01T11:43:34-04:00'
  effectiveAt: '2024-10-01T09:00:00-04:00'
---

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.