1import { Resend } from 'resend';
2
3const resend = new Resend('re_xxxxxxxxx');
4
5// Create a transactional sending domain
6const { data: domainData, error: createError } = await resend.domains.get(
7  'd91cd9bd-1176-453e-8fc1-35364d380206',
8);
9
10if (createError) {
11  console.error('Failed to create domain:', createError);
12}
13
14// Verify DNS ownership
15const { data: verifiedDomain, error: verifyError } = await resend.domains.verify(
16  'd91cd9bd-1176-453e-8fc1-35364d380206',
17);
18
19if (verifyError) {
20  console.error('Domain verification failed:', verifyError);
21} else {
22  console.log('Domain verified successfully for subscription alerts');
23}

1{
2  "id": "4dd369bc-aa82-4ff3-97de-514ae3000ee0",
3  "name": "example.com",
4  "created_at": "2026-03-28T17:12:02.059593+00:00",
5  "status": "not_started",
6  "open_tracking": true,
7  "click_tracking": false,
8  "tracking_subdomain": "links",
9  "capabilities": {
10    "sending": "enabled",
11    "receiving": "disabled"
12  },
13  "records": [
14    {
15      "record": "SPF",
16      "name": "send",
17      "type": "MX",
18      "ttl": "Auto",
19      "status": "not_started",
20      "value": "feedback-smtp.us-east-1.amazonses.com",
21      "priority": 10
22    },
23    {
24      "record": "SPF",
25      "name": "send",
26      "value": "\"v=spf1 include:amazonses.com ~all\"",
27      "type": "TXT",
28      "ttl": "Auto",
29      "status": "not_started"
30    }
31  ],
32  "region": "us-east-1"
33}

// Section 2: Create subscriber contacts for renewal and payment failure tracking
// No API calls in this section; contacts are managed in subsequent sections.

{
  "object": "contact",
  "id": "479e3145-dd38-476b-932c-529ceb705947"
}

1// Tag contacts with subscription and payment state properties
2// (resend instance reused from section 1)
3
4// Create custom contact properties for subscription and payment state
5await resend.contactProperties.create({
6  key: 'renewal_date',
7  type: 'string',
8  fallbackValue: '',
9});
10
11await resend.contactProperties.create({
12  key: 'payment_status',
13  type: 'string',
14  fallbackValue: 'pending',
15});
16
17await resend.contactProperties.create({
18  key: 'credit_balance',
19  type: 'string',
20  fallbackValue: '0',
21});
22
23// Tag contact with subscription and payment state properties
24const { data, error } = await resend.contacts.update({
25  email: 'customer@example.com',
26  unsubscribed: false,
27});

1// Segment contacts and queue renewal reminders via Resend
2// (resend instance reused from section 1)
3
4const renewalStages = [30, 7, 1];
5for (const daysUntil of renewalStages) {
6  const { data, error } = await resend.contacts.update({
7    email: 'subscriber@example.com',
8    unsubscribed: false,
9  });
10  if (!error) {
11    console.log(`Queued ${daysUntil}-day renewal reminder for contact ${data.id}`);
12  }
13}

// Section 5: Handle payment failures with triggered Resend alerts
// No API calls in this section; payment failure handling is coordinated via prior contact tagging.

1// Monitor delivery and optimize Resend transactional domain performance
2// (resend instance reused from section 1)
3
4// Monitor transactional domain reputation and delivery analytics
5const domainId = 'd91cd9bd-1176-453e-8fc1-35364d380206';
6const { data: domainMetrics, error } = await resend.domains.get(domainId);
7
8if (domainMetrics) {
9  console.log('Domain Status:', domainMetrics.status);
10  console.log('Open Tracking Enabled:', domainMetrics.open_tracking);
11  console.log('Click Tracking Enabled:', domainMetrics.click_tracking);
12  console.log('SPF/DKIM Records:', domainMetrics.records);
13  console.log('Sending Capability:', domainMetrics.capabilities.sending);
14}