Created a simple invite system that notifies users via e-mail when a corporate uploads an Excel file with already registered students

src/pages/api/invites/decline/[id].ts

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+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import type { NextApiRequest, NextApiResponse } from "next";
+import { app } from "@/firebase";
+import {
+  getFirestore,
+  getDoc,
+  doc,
+  deleteDoc,
+  setDoc,
+  getDocs,
+  collection,
+  where,
+  query,
+} from "firebase/firestore";
+import { withIronSessionApiRoute } from "iron-session/next";
+import { sessionOptions } from "@/lib/session";
+import { Ticket } from "@/interfaces/ticket";
+import { Invite } from "@/interfaces/invite";
+import { Group, User } from "@/interfaces/user";
+import { v4 } from "uuid";
+import { sendEmail } from "@/email";
+
+const db = getFirestore(app);
+
+export default withIronSessionApiRoute(handler, sessionOptions);
+
+async function handler(req: NextApiRequest, res: NextApiResponse) {
+  if (req.method === "GET") return await get(req, res);
+
+  res.status(404).json(undefined);
+}
+
+async function get(req: NextApiRequest, res: NextApiResponse) {
+  if (!req.session.user) {
+    res.status(401).json({ ok: false });
+    return;
+  }
+
+  const { id } = req.query as { id: string };
+  const snapshot = await getDoc(doc(db, "invites", id));
+
+  if (snapshot.exists()) {
+    const invite = { ...snapshot.data(), id: snapshot.id } as Invite;
+    if (invite.to !== req.session.user.id)
+      return res.status(403).json({ ok: false });
+
+    await deleteDoc(snapshot.ref);
+    const invitedByRef = await getDoc(doc(db, "users", invite.from));
+    if (!invitedByRef.exists()) return res.status(404).json({ ok: false });
+
+    const invitedBy = { ...invitedByRef.data(), id: invitedByRef.id } as User;
+
+    try {
+      await sendEmail(
+        "respondedInvite",
+        {
+          corporateName: invitedBy.name,
+          name: req.session.user.name,
+          decision: "decline",
+        },
+        [invitedBy.email],
+        `${req.session.user.name} has declined your invite!`,
+      );
+    } catch (e) {
+      console.log(e);
+    }
+
+    res.status(200).json({ ok: true });
+  } else {
+    res.status(404).json(undefined);
+  }
+}