Also looking for a solution. Migrated app to latest API but this does not help
Topic summary
Shopify Storefront API change now requires a cart key alongside the cart ID for cart mutations. Developers report they cannot find a way to obtain this key.
- Not available via standard queries (e.g., GetCartFromId).
- Not included in CARTS_UPDATE webhook payloads.
- Updating to the latest API version did not resolve access to the key.
Key terms:
- Cart ID: primary identifier for a cart.
- Cart key: new additional identifier now required for mutations.
- CARTS_UPDATE webhook: event payload used to react to cart changes.
Open issues/questions:
- How to retrieve the cart key when only the cart ID is available (e.g., from webhooks)?
- Whether Shopify will expose the key via queries or webhooks.
Status: Unresolved; no solution or official guidance provided in the thread yet.