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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（四）在铁路、城市轨道交通线路上私设道口或者平交过道的。
克林頓發言人表示，這些行程包括「為克林頓基金會工作而安排的停靠」。