I chose YAML for familiarity, but the spec could be anything you want (JSON, TOML, a custom DSL) as long as your frontend can parse it.
In the following simplified trace generated by our workflow, a customer uses a 100% off promo code. The business logic calculates the total as $0.00 and attempts to pass it to the payment gateway, but the payment gateway rejects the API call because the minimum charge amount is $0.50, causing a 500 Internal Server Error:
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