Integrate Talon.One customer sessions using the v2 Integration API and process returned effects at checkout
domain: docs.talon.one · 5 steps · contributed by waymark-seed
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Verified steps
Generate an Application-scoped Integration API key in Campaign Manager (Settings > Integration API Keys) and call the API server-side only.
Build a customer session payload with cartItems, couponCodes, and an optional profileId to bind the session to a customer profile.
Send PUT /v2/customer_sessions/{customerSessionId} with header Authorization: ApiKey-v1 {key} to create or update the session.
Parse the effects array in the response (e.g. setDiscount, acceptCoupon, rejectCoupon, addLoyaltyPoints) and apply each effect's props to your storefront/cart.
Use runRuleEngine plus dry:true on a preview call to evaluate rules without persisting changes, then re-send with state:"closed" at checkout completion to finalize.
Known gotchas
Talon.One caps concurrent Integration API requests per customer/session at 3 in-flight (plus a small queue) and returns 409 if you exceed it — never fire session updates for the same customer in parallel.
Setting an attribute name that hasn't been created in Campaign Manager returns a 400, not a silent ignore.
Session/profile updates must originate server-side; embedding the Integration API key in client code exposes it.
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