Shopify's draftOrderCreate API lacks idempotency, forcing developers to build their own safeguards

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Shopify's draftOrderCreate GraphQL mutation has no idempotency key support, meaning sending the same request twice creates duplicate draft orders — a serious problem for apps converting purchase orders automatically. Unlike payment APIs that allow safe retries via an idempotency header, Shopify's API leaves developers unable to distinguish a true failure from a timed-out request that may have succeeded. A developer building a Shopify wholesale app addressed this by logging every creation attempt in a database table with unique constraints, preventing duplicate operations even from race conditions like double-clicks or queue redeliveries. When a request ends without a response, the operation is marked 'UNCERTAIN' and a reconciliation job later queries Shopify using a correlation token embedded in the draft's tags, custom attributes, and metafields. One undocumented constraint the developer encountered was Shopify's 40-character tag length limit, which caused the first real draft creation to fail until the token format was shortened accordingly.

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