Underpayment Policy

Overview

An underpayment policy defines how the business responds after a payment has been verified as short of the obligation. It translates a discrepancy into an operational decision: accept it, request a top-up, hold fulfillment, issue credit, cancel, refund, or escalate for review. Without a policy, similar customers can receive inconsistent outcomes and accounting cannot explain why an order was marked paid.

The policy states how required and received value are measured. It identifies the invoice denomination, quote and expiry rules, precision, fee treatment, accepted assets and networks, aggregation of multiple transfers, confirmation threshold, and source of authoritative exchange rates. These inputs prevent a price update or sender fee from being mistaken for an arbitrary adjustment.

Underpayment tolerance supplies the allowable numeric difference, but the policy also defines eligibility and consequences. A threshold may be absolute, percentage-based, or the lesser of both, with stricter caps for irreversible goods, high values, new customers, or compliance-sensitive payments.

The customer path should state the remaining amount, deadline, acceptable top-up route, refund conditions, and support process. If the merchant accepts a short payment, the invoice remains unchanged and the exception record identifies the authorized write-off or discount. If funds are refunded, fees and destination verification are handled under a separate refund workflow.

Controls should assign an owner, approval limits, override authentication, reason codes, and an immutable record of every decision. The system must not let a late callback or additional transfer erase the earlier exception; it should add a linked event and recalculate status under the published rules.

Monitoring compares exception rates and losses by asset, network, wallet, provider, and checkout version. A rising pattern may indicate confusing fee presentation, broken quote logic, decimal errors, or malicious probing rather than isolated customer mistakes.

Cases outside automatic rules should enter a controlled underpayment recovery process with an assigned owner and final outcome.