---
title: >-
  Removed session.currentSession.staffMemberId from POS UI Extensions (2026-10)
  - 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/removed-session-currentsession-staffmemberid-from-pos-ui-extensions-2026-10
  md: >-
    https://shopify.dev/changelog/removed-session-currentsession-staffmemberid-from-pos-ui-extensions-2026-10.md
metadata:
  effectiveApiVersion: 2026-10
  affectedApi:
    - displayName: POS Extensions
      handle: pos-extensions
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: Breaking API Change
    handle: breaking-api-change
  indicatesActionRequired: true
  createdAt: '2026-09-16T13:29:03-04:00'
  postedAt: '2026-09-17T12:00:00-04:00'
  updatedAt: '2026-09-16T15:06:19-04:00'
  effectiveAt: '2026-09-17T12:00:00-04:00'
---

September 17, 2026

# Removed session.currentSession.staffMemberId from POS UI Extensions (2026-10)

DateSeptember 17, 2026

Version[2026-10](https://shopify.dev/changelog?api_version=2026-10)

Flags[Breaking API Change](https://shopify.dev/changelog?filter=breaking-api-change)[Action required](https://shopify.dev/changelog?action_required=true)

SurfacesAPI

Affected APIs[POS Extensions](https://shopify.dev/changelog?api_type=pos-extensions)

As of API version 2026-10, the static session.currentSession.staffMemberId field has been removed from the POS UI Extensions Session API. It was deprecated in 2026-07 in favour of session.staffMember, a reactive signal that updates when a different staff member pins into POS.

Before targeting API version 2026-10, replace reads of session.currentSession.staffMemberId with session.staffMember.value?.id. To react to staff changes while your extension is running, subscribe to the signal with session.staffMember.subscribe((staffMember) => { ... }), or read .value during render in a Preact component with @shopify/ui-extensions/preact imported to re-render automatically.

Extensions on 2026-07 and earlier are unaffected. The BaseData session.staffMemberId available to receipt targets is a separate API and is unchanged.

<https://shopify.dev/docs/api/pos-ui-extensions/2026-10/apis/session-api>