Changelog

Added full negotiation and settlement replay capabilities for audit and debugging.

• •New /replay/negotiation endpoint for replaying negotiation history
• •New /replay/settlement endpoint for replaying settlement execution
• •Deterministic state reconstruction from event log
• •Verification endpoints for comparing expected vs actual states

Fixed an issue where failed settlements could be retried incorrectly.

• •Improved idempotency key handling
• •Better error messages for duplicate settlement attempts
• •Fixed race condition in concurrent settlement requests

Support for executing settlements across multiple payment rails.

• •New adapters: Stripe, Wire, Ledger, ACH
• •Split settlement support for multi-party distributions
• •Configurable rail fallback chains
• •Rail-specific error handling

Enhanced webhook delivery and signature verification.

• •HMAC-SHA256 signature headers on all webhook deliveries
• •Exponential backoff retry logic (5 attempts)
• •Failed delivery logging and manual retry
• •New webhook event: receipt.verified

SOC 2 compliance and security improvements.

• •All API traffic encrypted with TLS 1.3
• •API key rotation endpoints
• •Audit logging for all operations
• •IP allowlisting support for production keys

Major protocol update with breaking changes.

• •New negotiation state machine with counter-offer support
• •Verity truth engine integration for all receipts
• •Agent capability registry
• •Breaking: New API response formats
• •Breaking: Negotiation terms schema updated