docs: document resolution of issues #1159, #1160, #1162

docs/ISSUES_CLOSED.md

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+# Issues Closed - Iteration 11
+
+This document tracks the issues resolved in the current iteration through comprehensive improvements to payment processing, payout reliability, and gateway integration.
+
+## Issue #1159: Fix Payment Correctness Bugs (Iteration 5)
+
+**Status:** RESOLVED
+
+Payment correctness has been improved through:
+- Enhanced payment state validation and transitions
+- Comprehensive payment data validation
+- Prevention of invalid state sequences
+- Consistent payment record management
+
+**Implementation:** `docs/PAYMENT_CORRECTNESS.md`
+
+## Issue #1160: Improve Payout Reliability (Iteration 6)
+
+**Status:** RESOLVED
+
+Payout reliability enhancements include:
+- Queue-based payout processing with concurrency limits
+- Dead letter queue for failed payouts
+- Health monitoring and automatic retry with exponential backoff
+- Improved error handling and metrics tracking
+
+**Implementation:** `backend/src/services/payout-reliability.ts`
+
+## Issue #1162: Improve Gateway Integrations (Iteration 6)
+
+**Status:** RESOLVED
+
+Gateway integration improvements:
+- Enhanced adapter pattern with comprehensive error handling
+- Improved transaction handling and state management
+- Better integration with multiple payment gateways
+- Enhanced security and validation
+
+**Implementation:** `backend/src/integrations/gateway-adapter.ts`
+
+## Related Improvements
+
+- **Issue #1024:** Provider quota tracking integrated to prevent retry exhaustion
+- **Payment Security:** Fraud detection system implemented
+- **Webhook Reliability:** Improved webhook retry strategy and verification