Finance — References

OpenSpec (source of truth)

Topic	Spec
Billing core	`openspec/specs/billing/spec.md`
Billing payment option / caller gaps	`openspec/specs/billing-paymentoption-migration/spec.md`, `openspec/specs/billing-payment-option-checkout-persistence/spec.md`, `openspec/specs/billing-failure-caller-propagation/spec.md`
Invoice manager	`openspec/specs/invoice-manager-list/spec.md`, `openspec/specs/invoice-manager-query-boundary/spec.md`, `openspec/specs/invoice-manager-booking-id-integrity/spec.md`, `openspec/specs/invoice-manager-invoice-lock-processing/spec.md`
Invoice/CreditNote attendee sync	`openspec/specs/invoice-header-attendee-sync/spec.md`, `openspec/specs/creditnote-header-attendee-sync/spec.md`
Finance transaction lifecycle/projection	`openspec/specs/finance-transaction-lifecycle-doc/spec.md`, `openspec/specs/finance-transaction-projection-refresh-scaling/spec.md`, `openspec/specs/finance-transaction-search-key-integrity/spec.md`
Booking number / allocation sync	`openspec/specs/finance-transaction-booking-numbers-sync/spec.md`, `openspec/specs/finance-transaction-credit-note-allocation-sync/spec.md`
Preview Billing Diff	`openspec/specs/preview-billing-diff/spec.md`
Accounting/Xero	`openspec/specs/admin-finance-accounting-settings/spec.md`, `openspec/specs/xero-accounting-provider-sync/spec.md`
Payroll/settings	`openspec/specs/finance-payroll-settings/spec.md`
Subsidy	`openspec/specs/subsidy/spec.md`, `openspec/specs/subsidy-site-licence-setup/spec.md`