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+1. Use gRPC for all internal service communication by default. Can use REST case by case.
+
+2. Use JWT public-private key for authentication.
+
+Generate a Ed25519 public-private key pair.
+
+```bash
+openssl genpkey -algorithm Ed25519 --out keyfile.pem
+
+openssl pkey -in keyfile.pem -pubout -out keypub.pem
+```
+
+- Use the private key to generate a JWT token using relevant payload.
+- Use the token in client side and verify the token in server side using the public key.
+- Same public-private key pair can be used for all services.