https://e343c64b.dataagentx.pages.dev/en/tags/dabstep/Recent content in DABstep on DataAgentXHugoen-USThu, 22 Oct 2026 00:00:00 +0000https://e343c64b.dataagentx.pages.dev/en/tech/20261022-payment-fee-change/Thu, 22 Oct 2026 00:00:00 +0000https://e343c64b.dataagentx.pages.dev/en/tech/20261022-payment-fee-change/<p><a href="https://e343c64b.dataagentx.pages.dev/images/articles/payment-fee-change/core-en.svg"><img src="https://e343c64b.dataagentx.pages.dev/images/articles/payment-fee-change/core-en.svg" alt="Step-by-step differential calculation from rule conditions to the affected set"></a></p> <p>If a payment fee rate is reduced from 14 basis points to 1 basis point, how much can a merchant save in a month?</p> <p>While this appears to be a multiplication problem, the actual challenge lies before the multiplication: determining which transactions are affected. This analysis recalculates two &ldquo;hard&rdquo; problems from DABstep, with a focus on defining the scope and performing independent verification.</p>