Lifecycle
The charge lifecycle: statuses, the state machine and day-to-day transitions, from pending to write-off and recovery.
Amounts and due date
A charge's amounts: original, current, paid and balance, and how the due date sets when the collection rule kicks in.
Payment and settlement
Payment and settlement: how a payment comes in, what happens at settlement, the I-already-paid check and the legal hold.
Charge sources
Charge sources: the field that records where each charge came from — manual, spreadsheet, API or integration — to filter and diagnose.
Fees and adjustments
Charge fees: fine, late interest, monetary correction and discount, computed idempotently in cents and in the organization's time zone.