The server blinked, and the data moved faster than you could count. That is the power of building your procurement process with gRPC. It strips away the overhead of REST while giving you a contract-first approach with Protocol Buffers. Calls are small, fast, and predictable. You push a request. You get a response. No wasted bytes.
A procurement process is not a single request. It is a chain of steps—supplier onboarding, purchase requests, approvals, orders, and payments. Each step has its own payloads and rules. With gRPC, you define these in .proto files. You set data types, enums, and services once. Changes hit your clients and servers instantly after regeneration. There is no drift.
For synchronous workflows, gRPC’s unary RPC calls keep things simple. For handling live updates—like a change in inventory mid-request—you use server-streaming. The supplier sends a quick price change, and your client sees it before the purchase order locks. For approvals that need back-and-forth, bidirectional streaming lets buyer and supplier update in real time.