Direct answer: from 1 December 2026, Shopify's Built for Shopify requirements say that returns and exchanges apps (and subscription apps) with buyer-facing self-service experiences must use the Customer Account API for customer authentication. The stated consequence for missing it, in Shopify's own words, is being "at risk of losing Built for Shopify status" — not removal from the App Store, and neither source we checked says otherwise. Since the same rule sits in the general Built for Shopify requirements list (not a one-time migration notice), it's a reasonable reading — not something either source states outright — that an app without the badge yet would also need to meet it to qualify, not only to keep it.
What the rule says, plainly
Shopify published this in its developer changelog on 17 June 2026: "Returns and exchanges and Subscription apps with buyer-facing self-service experiences must use the Customer Account API for customer authentication" (Shopify changelog, checked 2026-09-25). The deadline is 1 December 2026. The same requirement appears in Shopify's Built for Shopify requirements documentation, as item 5.12.4 under the returns-and-exchanges-apps section: "Your app must support the Customer Account API as the primary method for customer authentication" (Built for Shopify requirements, checked 2026-09-25). Neither page mentions a guest-checkout exception or a grace period beyond the stated date.
Who it affects
This sits inside Shopify's Built for Shopify requirements for the returns-and-exchanges-apps category, alongside three related requirements in the same numbered section: syncing return lifecycle events to Shopify (5.12.1), including exchange line items when managing exchanges (5.12.2), and including shipping and restocking fees where applicable (5.12.3). In other words, on the pages we checked, it's one line item in the set of requirements an app has to meet to hold or gain Built for Shopify status — it isn't framed there as a rule every returns app must follow just to stay listed on the App Store at all. An app that never seeks Built for Shopify status isn't described as being bound by section 5.12.
What "New Customer Accounts" and "the Customer Account API" mean for a merchant
Shopify has two generations of customer accounts: the older ones, which Shopify's own documentation calls "legacy customer accounts," and New Customer Accounts, which are what the Customer Account API is built around. A merchant can check which one a store is on under Settings → Customer accounts in the Shopify admin. An app that authenticates buyers through the Customer Account API works with New Customer Accounts; an app built only against the older account system doesn't meet 5.12.4 as worded above.
What happens if a returns app doesn't migrate in time
The changelog states the consequence plainly: apps that don't meet the requirement by the deadline are described as being at risk of losing Built for Shopify status. That's what the source says, and this article stops there — it doesn't say, and we haven't found anything stating, that a non-migrated app is removed from the App Store or otherwise loses its listing. If a merchant's current returns app carries the Built for Shopify badge today, this deadline is a reason that badge could change after 1 December 2026; on the sources checked here, it isn't a reason the app itself would disappear.
Where Comeback fits
Comeback, an app we're building for Shopify stores, is being built on New Customer Accounts and the Customer Account API from the start, rather than adding them later to meet this deadline. That's a fact about a build choice we made, not a claim about what happens to any other app — we haven't checked any other app's migration status, and this isn't a prediction that others will miss the date.
Sources checked
- Shopify changelog, "Built for Shopify requirements for returns and exchanges, and Subscription apps," published 2026-06-17, checked 2026-09-25.
- Shopify, Built for Shopify requirements documentation, sections 5.12.1–5.12.4, checked 2026-09-25.