Shopify API versioning and what breaks

Most integration cost estimates cover the build. The part that is routinely left out is that Shopify's API moves on a quarterly rhythm and every version eventually stops working.

An integration is therefore not a thing you finish. It is a thing you keep, and the keeping has a predictable cost.

The rhythm

Shopify publishes a new API version each quarter, in January, April, July and October. Each stable version is supported for roughly a year from release, so at any moment several versions are live and the oldest is approaching retirement.

The practical effect is a rolling window: once a version is released, you have until its retirement to move off the one you are on, and that window is long enough to be comfortable and short enough that skipping a cycle is dangerous. An integration that ignores two consecutive releases is close to the edge of a version it cannot stay on.

Versions also arrive as a release candidate before becoming stable, which is the window to test against rather than the window to deploy into.

The four ways an upgrade bites

Not usually the thing people fear. A well-built integration rarely breaks catastrophically. It breaks narrowly and quietly, and here is where.

Fields that were removed or renamed. The most common cause. A field your code reads is deprecated in one version and gone in a later one. The query no longer returns it, and depending on how the code is written you either get an error or a null that gets treated as zero.

Types that changed shape. A money value that used to be a single amount becoming an object with amount and currency inside it. Code reading the old shape gets something it does not understand, and the failure mode depends entirely on how defensively it was written.

Behaviour that changed without the field changing. The subtlest and hardest to test for. The same field, still present, now populated differently — a status that gains a new possible value, or a total that starts including something it previously excluded. Nothing errors. The numbers move.

Deprecated endpoints and operations. An operation that was the way to do something is superseded, and the replacement has different semantics rather than just a different name.

That third category is why version upgrades need reconciliation testing, not just a smoke test. A change in what a total includes will pass every functional test and quietly misstate revenue.

The cost nobody budgets

Four times a year, somebody has to review the release notes for changes affecting the fields you actually use, test against the release candidate, and schedule a migration before the version you are on retires.

For an in-house integration that is a recurring engineering commitment, and it competes with every other priority. It is also the kind of work that gets deferred, because nothing is broken today. Deferral works right up until it does not, and the failure lands on a date Shopify published a year in advance.

This is the strongest single argument for using a maintained connector rather than building your own, and it has nothing to do with the difficulty of the initial build. The build is a known quantity. The maintenance is indefinite — see what it takes to build a Shopify connector.

What to do about it if you own the code

Pin your version explicitly. Never call an unversioned or default endpoint. You want to control when behaviour changes, not discover it.

Keep a list of the fields you depend on. Short, maintained, and checked against each release's changes. This turns a full release-note review into a targeted one and takes minutes instead of hours.

Test against the release candidate, on a copy of real data, before the version is stable. A development store with a handful of orders will not surface the changes that matter.

Reconcile after upgrading, not just before. Run a period through the new version and compare the totals against what the old version produced for the same period. Any difference is either a bug you introduced or a behaviour change you had not spotted, and both are worth knowing before month end — see keeping automated books healthy.

Log the version you called. When a historical figure looks wrong, knowing which API version produced it is the difference between a diagnosis and a guess.

What to ask a vendor about this

If somebody else maintains the integration, the version question is theirs and you are entitled to a clear answer.

Which version are you currently on. How long after a Shopify release do you typically upgrade. What happened at the last retirement — did anything break, and how did customers find out. Do you notify customers before an upgrade, and do you re-run reconciliation afterwards.

A vendor with good answers has done this several times. A vendor who has never been through a retirement cycle has an obligation ahead of them that neither of you has priced — see how to evaluate AI accounting software.

Common questions

How often does the Shopify API change?

A new version is published quarterly, in January, April, July and October, with each stable version supported for roughly a year from release. Several versions are live at once and the oldest is always approaching retirement, so an integration that skips two consecutive releases is near the limit of the version it is running on.

What usually breaks on a Shopify API version upgrade?

Most often a field that was deprecated and then removed, or one whose type changed shape — a plain money amount becoming an object with amount and currency. The more dangerous category is a field that still exists but is populated differently, such as a total that starts including something it previously excluded, because nothing errors and the numbers simply move.

Why does a version upgrade need reconciliation testing?

Because behaviour changes pass functional tests. If a total now includes a component it previously excluded, every request still succeeds and every field is still present, so only comparing reconciled figures for the same period across both versions will reveal it. Running that comparison after the upgrade is what catches it before month end does.

Who carries the cost of Shopify API maintenance?

Whoever owns the integration code. For an in-house build it is a recurring quarterly engineering commitment that competes with other priorities and tends to be deferred, since nothing appears broken until the version retires on a date published a year earlier. Using a maintained connector transfers that obligation, which is the main argument for it.

Related: why Shopify moved to GraphQL · what it takes to build a Shopify connector · why integration depth beats feature count