Kristijan Zivcec developed the ICPAY Ecosystem Integration for the coinbase/x402 repository, enabling crypto payments through SDKs and widgets for applications and AI agents. He focused on robust API integration and full stack development, implementing facilitator scaffolding to support merchant verification and settlement workflows. Kristijan addressed a signature verification bug, enhancing transaction security and reliability within the ICPAY onboarding process. His work included updating partner metadata and branding assets using JSON, ensuring clear categorization under infrastructure and tooling. The integration expanded the x402 ecosystem’s crypto capabilities and improved onboarding readiness, reflecting a thoughtful approach to security and maintainability in production environments.