Implement redux.

pages/api/user.js

@@ -0,0 +1,12 @@
+import { verifySecureToken } from 'lib/crypto';
+
+export default async (req, res) => {
+  const { token } = req.body;
+
+  try {
+    const payload = await verifySecureToken(token);
+    return res.status(200).json(payload);
+  } catch {
+    return res.status(400).end();
+  }
+};