Seshn + Resend

1npm install resend

1import { Resend } from 'resend';
2import { createHmac } from 'crypto';
3
4const resend = new Resend(process.env.RESEND_API_KEY);
5const WEBHOOK_SECRET = process.env.SESHN_WEBHOOK_SECRET!;
6
7export async function POST(req: Request) {
8  const body = await req.text();
9  const signature = req.headers.get('x-webhook-signature');
10
11  // Verify the webhook signature
12  const expected = 'sha256=' +
13    createHmac('sha256', WEBHOOK_SECRET).update(body).digest('hex');
14
15  if (signature !== expected) {
16    return new Response('Invalid signature', { status: 401 });
17  }
18
19  const event = req.headers.get('x-webhook-event');
20  const payload = JSON.parse(body);
21
22  switch (event) {
23    case 'booking.created':
24      await resend.emails.send({
25        from: 'bookings@yourdomain.com',
26        to: payload.contact.email,
27        subject: 'Booking confirmed',
28        html: `
29          <h1>You're booked!</h1>
30          <p><strong>${payload.service.name}</strong></p>
31          <p>${new Date(payload.slot.startTime).toLocaleString()}</p>
32          <p>${payload.seats} seat(s) reserved.</p>
33        `,
34      });
35      break;
36
37    case 'booking.cancelled':
38      await resend.emails.send({
39        from: 'bookings@yourdomain.com',
40        to: payload.contact.email,
41        subject: 'Booking cancelled',
42        html: `
43          <h1>Booking cancelled</h1>
44          <p>Your booking for <strong>${payload.service.name}</strong> has been cancelled.</p>
45        `,
46      });
47      break;
48
49    case 'booking.rescheduled':
50      await resend.emails.send({
51        from: 'bookings@yourdomain.com',
52        to: payload.contact.email,
53        subject: 'Booking rescheduled',
54        html: `
55          <h1>New time confirmed</h1>
56          <p><strong>${payload.service.name}</strong></p>
57          <p>${new Date(payload.newSlot.startTime).toLocaleString()}</p>
58        `,
59      });
60      break;
61
62    case 'waitlist.promoted':
63      await resend.emails.send({
64        from: 'bookings@yourdomain.com',
65        to: payload.contact.email,
66        subject: 'You got a spot!',
67        html: `
68          <h1>Good news!</h1>
69          <p>A spot opened up for <strong>${payload.service.name}</strong>
70          and you've been automatically booked.</p>
71        `,
72      });
73      break;
74  }
75
76  return new Response('OK', { status: 200 });
77}

1curl -X POST https://api.seshn.net/v1/webhooks \
2  -H "Authorization: Bearer sk_live_..." \
3  -H "Content-Type: application/json" \
4  -d '{
5    "url": "https://yourdomain.com/api/webhooks/seshn",
6    "events": [
7      "booking.created",
8      "booking.confirmed",
9      "booking.cancelled",
10      "booking.rescheduled",
11      "waitlist.promoted"
12    ]
13  }'