tl;dr:“Ledger models internal data-producing systems with common patterns, and it relies on proactive alerting to surface issues and proposed solutions. Each day, Ledger sees five billion events and 99.99% of our dollar volume is fully ingested and verified within four days. Of that activity, 99.999% is monitored, categorized, and triaged through rich investigative tooling — while the remaining long-tail is reliably handled through manual analysis.” This post shares technical details on how Stripe built this money movement tracking system, and how teams interact with the data quality metrics that underlie our global payments network.