Shopify API 2025-07 retires July 16; apps silently shift to 2025-10 without errors

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Shopify will stop serving API version 2025-07 on July 16, 2026 at 15:00 UTC, but apps still pinned to that version will not receive error responses. Instead, Shopify's 'fall-forward' behavior automatically serves requests using the next stable version, 2025-10, returning a 200 OK with a potentially different response structure. The actual version served is disclosed in the X-Shopify-API-Version response header, which most clients never inspect, making the switch invisible at the network level. Real schema changes between the two versions — including a widened union type for StoreCreditAccount.owner, deprecation of ProductVariant.taxCode, and a singular-to-connection change for InventoryItem.variant — can silently break data parsing, reconciliation logic, or tax classification. Developers are advised to compare the requested and returned API version headers on every response to detect unintended fall-forward behavior before it causes downstream issues.

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