As part of the GraphQL Storefront API 2026-01 release , the cartDiscountCodesUpdate mutation now requires the discountCodes argument to be included. Previously, mutation calls without the discountCodes argument were allowed, but would not actually modify the cart in any way.
Summary extracted from the official source text. Verify details on the source page.
| Platform | Shopify |
|---|---|
| Effective date | No date published |
| Precision | n/a |
| Published | 2025-10-30 |
| Categories | Breaking / action required |
| Tags | 2026-01, API, Action Required, Storefront API, Update |
| Official source | Shopify developer changelog ↗ |
| Fetched | 2026-10-17T03:44:00+00:00 |
| First seen | 2026-10-17T01:05:46+00:00 |
| Status | Listed by the source |
| Stable ID | shopify-61516772a2 · JSON |