Server SDK

import { ZendServer, verifyWebhook, verifyAttestation } from "@zendfi/appkit/server";

const zend = new ZendServer(process.env.ZEND_APP_KEY!);

const user = await zend.verifySession(appSession);
// { app_user_id, username, name, avatar, scopes, email?, address? }

await zend.createInteraction({
  type: "challenge",
  created_by: "@tunde",          // or zu_...
  participants: ["@danny"],
  data: { round: 1 },
  visibility: "participants",
  expires_in_secs: 3600,
});

const it = await zend.getInteraction("int_...");

await zend.updateInteraction(id, {
  state: "resolved",
  data: { winner: "zu_..." },
  idempotency_key: `${id}:resolve`,
  expected_version: 3,
});