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Order Payment Reconciler
Medium
A billing system needs to match incoming payments to open orders. Each payment arrives as a comma-separated string with three fields: a payment ID, a payment amount (positive integer), and a memo note. The memo may contain a reference like "ref:<orderId>" indicating which order the payment targets. Each order is also a comma-separated string with three fields: an order ID, an order amount (positive integer), and a due date in "YYYY-MM-DD" format.
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