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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A microfluidics chip enables researchers to manipulate and study individual cells, without the use of agar at all. Credit: Brouzes E. et al. PNAS (2009).