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<form action="/api/applyonce/session" method="POST">
  <button>Apply with ApplyOnce</button>
</form>
// Your server creates a session and redirects with HTTP 303.

import { createApplyOnce } from "@applyonce/sdk";
const applyonce = createApplyOnce({
  apiKey: process.env.APPLYONCE_API_KEY,
  baseUrl: process.env.APPLYONCE_API_URL
});
// Store a random state nonce in a server session first.
const session = await applyonce.createShareSession({
  formSlug: "bta-jee-2026",
  returnUrl: "https://your-portal.example/api/applyonce/callback",
  state: savedNonce
});
// In your callback, validate state before exchanging:
const { payload, consent_id } = await applyonce.exchange(shareToken);