Shopify Marketing Agency Advisory: October API Update Changes How Shipping, Inventory and Order Apps Work

Shopify’s 2026-10 API version, stable since Oct. 1, removes the incomplete-checkout field from the Customer Account API, and the Admin API now returns errors for metafield filters it cannot apply.*Newly registered carrier services no longer add rates to Shopify’s General shipping profile, and shipping-address changes made through the Admin API on unfulfilled orders now recalculate taxes.*Optimum7 is advising merchants to map which API version each custom app and connected system calls before ado