Late deposit received on an expired invoice.
Fired when a payment arrives after the invoice has already expired. The merchant can decide whether to credit the customer.
Signature: X-Halfin-Signature: t={timestamp},v1={hmac}
where hmac = HMAC-SHA256(secret, "{timestamp}.{raw_body}").
Reject if abs(now - timestamp) > 300 seconds.
Event type identifier.
"invoice.late_deposit"Event creation timestamp.
date-timePayload data for invoice.late_deposit events.
Commit 2 of the rate-freshness + offerability refactor adds
four OPTIONAL fields (rate_applied, rate_updated_at,
rate_age_ms, rate_stale) that land ONLY on static-address
credits. Invoice-based late deposits carry a slot-locked rate
and omit these fields — the slot's exchange_rate is
authoritative for the invoice-based case. Merchant SDK
consumers that depend on additionalProperties: false are
unaffected because the new keys are explicitly listed.