🎯PSM DOI Middleware

The DOI PSM is a mission-critical middleware solution designed to handle high-throughput transactional requests (primarily DOI/Push notifications). It serves as a robust buffer between client applications and sensitive downstream infrastructure (like OTA/HSM servers), ensuring reliability through asynchronous processing, rate limiting, and failure recovery.

The PSM is a critical middleware solution designed to bridge the gap between modern, high-velocity web applications and legacy telecommunications infrastructure.

Its primary mandate is to facilitate secure Over-The-Air (OTA) updates to subscriber SIM cards. By abstracting the complexities of cryptographic hardware (HSM) and binary SMS delivery (SMPP), the PSM provides a clean, RESTful interface for upstream clients while ensuring strict compliance, auditability, and reliability in downstream delivery.