> ## Documentation Index > Fetch the complete documentation index at: https://docs.grain.inc/llms.txt > Use this file to discover all available pages before exploring further. # Release Notes > Latest updates and changes to the Grain platform Subscribe to release notifications in your Dashboard under **Settings > Notifications** to get notified when new versions are published. ### v2.5.0 --- March 24, 2026 **Added** * Automatic capture of funded payment sessions with a new explicit capture API for greater payment control. * Fee computation service calculating Grain fees, network fees, and net payouts based on partner take rates and transaction status. * Core data models for Users, Partners, Team Members, Take Rates, and Payments, establishing the foundation for partner management. * Persistent payment records with rich details including currency, network/token info, fee breakdowns, and net payout — all normalized to cents with idempotent handling. * Erebor KYB service integration for full business and person applicant management, onboarding flows, and document upload/retrieval. * End-of-day Slack transaction report powered by Trigger.dev, delivering daily aggregated payment summaries. * Threaded Slack notifications per payment transaction with persistent thread IDs for easier tracking. **Improved** * Multi-AZ Redis failover for production, ensuring high availability with automatic failover across availability zones. * Optional custom domain support for API (ALB) and CDN (CloudFront) via Route53 alias records with ACM certificate integration. * WAF rate-limiting rule protecting the ALB at 2,000 requests per 5 minutes per IP. * VPC endpoints for S3, Secrets Manager, KMS, and STS to reduce NAT costs and improve latency. * AWS Backup integration with daily automated backups (7-day retention for dev, 35-day for prod) and optional cross-region backup copy. * GuardDuty findings forwarded to SNS via EventBridge and AWS Config recorder added for Vanta compliance. * CloudWatch security alarms wired to SNS for root account usage, MFA-less console login, failed logins, and unauthorized API calls. * Resource tagging across all CDK stacks (`Environment`, `Project`, `ManagedBy`) for compliance and cost attribution. * Lambda reserved concurrency limits set per environment to prevent account-level exhaustion. * SQS dead letter queue added for failed async Lambda invocations with KMS encryption and 14-day retention. **Fixed** * Payment processing now uses the specified amount rather than a hardcoded default. * Simplified API key handling in payment sessions and improved webhook error handling and logging. *** ### v2.4.0 --- March 10, 2026 **Added** * Support for USDC payments on the Arbitrum network, giving customers a lower-fee payment option. * New `payment.settlement.completed` webhook event so you can track settlement in real time. * Bulk export of transaction history as CSV from the Dashboard. **Improved** * Reduced average API response time for the `/payments` endpoint by 35%. * Updated the Dashboard transaction detail view with clearer status labels and a timeline of payment lifecycle events. **Fixed** * Resolved an issue where webhook signature verification failed intermittently when the payload contained non-ASCII characters. * Fixed a display bug in the Dashboard that showed incorrect settlement amounts for refunded transactions. *** ### v2.3.0 --- February 14, 2026 **Added** * Multi-user access for merchant accounts with configurable roles (Owner, Admin, Viewer). * Support for setting a preferred settlement currency per payment, overriding the account default. **Improved** * Sandbox environment now simulates realistic blockchain confirmation delays for more accurate integration testing. * Webhook retry schedule adjusted to include a faster first retry (30 seconds instead of 5 minutes). **Fixed** * Fixed a race condition that could cause duplicate `payment.confirmed` webhook deliveries under high throughput. * Corrected exchange rate display rounding in the customer-facing payment page for JPY-denominated merchants. *** ### v2.2.0 --- January 20, 2026 **Added** * Introduced idempotency key support on the `POST /payments` endpoint to prevent duplicate payment creation. * New status page integration for real-time service health visibility at [status.grain.com](https://status.grain.com). **Improved** * Upgraded on-chain monitoring to detect payments with zero confirmations, reducing perceived confirmation time for supported networks. * Dashboard loading performance improved by 40% through optimized data fetching. **Fixed** * Resolved an issue where expired payment sessions were not correctly marked as `expired` in the API response. * Fixed CSV export encoding issue that affected merchants using special characters in product descriptions.