email service and template using resend

.env.example

@@ -44,4 +44,16 @@ CRON_SECRET=
 #   1. Discord channel internal → Edit Channel → Integrations → Webhooks → New
 #   2. Copy "Webhook URL", paste di sini
 # Format: https://discord.com/api/webhooks/<id>/<token>
-ADMIN_ALERT_WEBHOOK_URL=
+ADMIN_ALERT_WEBHOOK_URL=
+
+
+# === Email notifications (Resend) ===
+# API key Resend untuk kirim email transaksional (KYC, refund, payment, suspend).
+# Tanpa env, sync send di-skip dan semua email di-queue di DB (status PENDING).
+# Setelah env di-set, cron `/api/cron/process-email-jobs` akan drain queue.
+# Sign up: https://resend.com → API Keys
+RESEND_API_KEY=
+# Email sender — format RFC 5322 "Display Name <email@domain>".
+# Domain harus diverifikasi di Resend dashboard (SPF + DKIM).
+# Default `onboarding@resend.dev` cocok untuk dev/testing.
+EMAIL_FROM="SeTrip <onboarding@resend.dev>"