This Guidance demonstrates how payment operators can deploy an event-driven architecture to receive, consume, and release ISO 20022 payment messages. Customers can benefit from a multi-Region architecture, tunable consistency, and with the decision-making process managed by API consumers. This allows for the acceptance, rejection, cancellation, and redrive of data processing workflows, with failover across AWS Regions. Payment operators can deploy this Guidance as a proxy in front of their existing payment infrastructure, on-premises, in the cloud, or use it as the foundational building block to modernize payment processes.