feat: add confirmation emails and Listmonk newsletter sync

- Add nodemailer SMTP integration for payment confirmation emails
  via newsletter@cryptocommonsgather.ing
- Add Listmonk PostgreSQL integration for newsletter subscriber sync
- Update webhook to send confirmation email after Stripe payment
- Add SMTP and Listmonk env vars to docker-compose

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/api/webhook/route.ts

@@ -1,6 +1,8 @@
 import { type NextRequest, NextResponse } from "next/server"
 import Stripe from "stripe"
 import { updatePaymentStatus } from "@/lib/google-sheets"
+import { sendPaymentConfirmation } from "@/lib/email"
+import { addToListmonk } from "@/lib/listmonk"
 
 // Lazy initialization to avoid build-time errors
 let stripe: Stripe | null = null
@@ -61,7 +63,30 @@ export async function POST(request: NextRequest) {
           console.error(`[Webhook] Failed to update Google Sheet for ${metadata.name}`)
         }
 
-        // TODO: Send confirmation email
+        // Send payment confirmation email
+        if (customerEmail) {
+          await sendPaymentConfirmation({
+            name: metadata.name || "",
+            email: customerEmail,
+            amountPaid: session.amount_total
+              ? `€${(session.amount_total / 100).toFixed(2)}`
+              : "",
+            paymentMethod: session.payment_method_types?.[0] || "card",
+            contributions: metadata.contributions || "",
+            dietary: metadata.dietary || "",
+          })
+
+          // Add to Listmonk newsletter
+          addToListmonk({
+            email: customerEmail,
+            name: metadata.name || "",
+            attribs: {
+              contact: metadata.contact,
+              contributions: metadata.contributions,
+              expectations: metadata.expectations,
+            },
+          }).catch((err) => console.error("[Webhook] Listmonk sync failed:", err))
+        }
 
         break
       }

docker-compose.yml

@@ -12,14 +12,35 @@ services:
       - GOOGLE_SERVICE_ACCOUNT_KEY=${GOOGLE_SERVICE_ACCOUNT_KEY}
       - GOOGLE_SHEET_ID=${GOOGLE_SHEET_ID}
       - GOOGLE_SHEET_NAME=${GOOGLE_SHEET_NAME:-Registrations}
+      - SMTP_HOST=${SMTP_HOST:-mail.rmail.online}
+      - SMTP_PORT=${SMTP_PORT:-587}
+      - SMTP_USER=${SMTP_USER:-newsletter@cryptocommonsgather.ing}
+      - SMTP_PASS=${SMTP_PASS}
+      - EMAIL_FROM=${EMAIL_FROM:-Crypto Commons Gathering <newsletter@cryptocommonsgather.ing>}
+      - LISTMONK_DB_HOST=${LISTMONK_DB_HOST:-listmonk-db}
+      - LISTMONK_DB_PORT=${LISTMONK_DB_PORT:-5432}
+      - LISTMONK_DB_NAME=${LISTMONK_DB_NAME:-listmonk}
+      - LISTMONK_DB_USER=${LISTMONK_DB_USER:-listmonk}
+      - LISTMONK_DB_PASS=${LISTMONK_DB_PASS}
+      - LISTMONK_LIST_ID=${LISTMONK_LIST_ID:-22}
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.ccg.rule=Host(`cryptocommonsgather.ing`) || Host(`www.cryptocommonsgather.ing`)"
       - "traefik.http.routers.ccg.entrypoints=web,websecure"
       - "traefik.http.services.ccg.loadbalancer.server.port=3000"
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://127.0.0.1:3000/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 15s
     networks:
       - traefik-public
+      - listmonk-internal
 
 networks:
   traefik-public:
     external: true
+  listmonk-internal:
+    external:
+      name: listmonk_listmonk-internal

lib/email.ts

@@ -0,0 +1,110 @@
+import nodemailer from "nodemailer"
+
+// Lazy-initialized SMTP transport (Mailcow)
+let transporter: nodemailer.Transporter | null = null
+
+function getTransporter() {
+  if (!transporter && process.env.SMTP_PASS) {
+    transporter = nodemailer.createTransport({
+      host: process.env.SMTP_HOST || "mail.rmail.online",
+      port: parseInt(process.env.SMTP_PORT || "587"),
+      secure: false,
+      auth: {
+        user: process.env.SMTP_USER || "newsletter@cryptocommonsgather.ing",
+        pass: process.env.SMTP_PASS,
+      },
+      tls: { rejectUnauthorized: false },
+    })
+  }
+  return transporter
+}
+
+const EMAIL_FROM =
+  process.env.EMAIL_FROM ||
+  "Crypto Commons Gathering <newsletter@cryptocommonsgather.ing>"
+
+interface PaymentConfirmationData {
+  name: string
+  email: string
+  amountPaid: string
+  paymentMethod: string
+  contributions: string
+  dietary: string
+}
+
+export async function sendPaymentConfirmation(
+  data: PaymentConfirmationData
+): Promise<boolean> {
+  const transport = getTransporter()
+  if (!transport) {
+    console.log("[Email] SMTP not configured, skipping confirmation email")
+    return false
+  }
+
+  const html = `
+    <div style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; max-width: 600px; margin: 0 auto; padding: 20px; color: #333;">
+      <h1 style="color: #f59e0b; margin-bottom: 8px;">You're In!</h1>
+      <p style="font-size: 15px; color: #92400e; margin-top: 0; margin-bottom: 28px; font-style: italic;">Crypto Commons Gathering 2026</p>
+
+      <p>Dear ${data.name},</p>
+
+      <p>Your payment of <strong>${data.amountPaid}</strong> has been confirmed. You are now registered for <strong>Crypto Commons Gathering 2026</strong> in Austria's H&ouml;llental Valley, August 16&ndash;22, 2026.</p>
+
+      <div style="background: #fffbeb; padding: 20px; border-radius: 8px; margin: 24px 0; border-left: 3px solid #f59e0b;">
+        <h3 style="margin-top: 0; color: #92400e;">Registration Details</h3>
+        <table style="width: 100%; border-collapse: collapse;">
+          <tr>
+            <td style="padding: 4px 0;"><strong>Amount:</strong></td>
+            <td style="padding: 4px 0;">${data.amountPaid}</td>
+          </tr>
+          <tr>
+            <td style="padding: 4px 0;"><strong>Payment:</strong></td>
+            <td style="padding: 4px 0;">${data.paymentMethod}</td>
+          </tr>
+          ${data.dietary ? `<tr><td style="padding: 4px 0;"><strong>Dietary:</strong></td><td style="padding: 4px 0;">${data.dietary}</td></tr>` : ""}
+        </table>
+      </div>
+
+      ${data.contributions ? `
+      <div style="background: #f5f5f0; padding: 16px; border-radius: 8px; margin: 24px 0;">
+        <strong style="color: #92400e;">What you're bringing:</strong>
+        <p style="margin-bottom: 0; margin-top: 8px;">${data.contributions}</p>
+      </div>
+      ` : ""}
+
+      <h3 style="color: #92400e;">What's Next?</h3>
+      <ul style="line-height: 1.8;">
+        <li>Join the <a href="https://t.me/+n5V_wDVKWrk1ZTBh" style="color: #f59e0b;">CCG26 Telegram group</a> to connect with other participants</li>
+        <li>Start preparing your session proposals</li>
+        <li>Watch for pre-event communications with logistics details</li>
+      </ul>
+
+      <p style="margin-top: 32px;">
+        See you in the valley,<br>
+        <strong>The Crypto Commons Gathering Team</strong>
+      </p>
+
+      <hr style="border: none; border-top: 1px solid #ddd; margin: 32px 0;">
+      <p style="font-size: 12px; color: #666;">
+        You received this email because you registered at cryptocommonsgather.ing.<br>
+        <a href="https://cryptocommonsgather.ing">cryptocommonsgather.ing</a>
+      </p>
+    </div>
+  `
+
+  try {
+    const info = await transport.sendMail({
+      from: EMAIL_FROM,
+      to: data.email,
+      subject: "Registration Confirmed - Crypto Commons Gathering 2026",
+      html,
+    })
+    console.log(
+      `[Email] Payment confirmation sent to ${data.email} (${info.messageId})`
+    )
+    return true
+  } catch (error) {
+    console.error("[Email] Failed to send payment confirmation:", error)
+    return false
+  }
+}

lib/listmonk.ts

@@ -0,0 +1,92 @@
+import pg from "pg"
+
+const { Pool } = pg
+
+// Lazy-initialized Listmonk PostgreSQL connection
+let pool: pg.Pool | null = null
+
+function getPool() {
+  if (!pool && process.env.LISTMONK_DB_HOST) {
+    pool = new Pool({
+      host: process.env.LISTMONK_DB_HOST,
+      port: parseInt(process.env.LISTMONK_DB_PORT || "5432"),
+      database: process.env.LISTMONK_DB_NAME || "listmonk",
+      user: process.env.LISTMONK_DB_USER || "listmonk",
+      password: process.env.LISTMONK_DB_PASS || "",
+    })
+  }
+  return pool
+}
+
+const LISTMONK_LIST_ID = parseInt(process.env.LISTMONK_LIST_ID || "22") // Crypto Commons list
+
+interface SubscriberData {
+  email: string
+  name: string
+  attribs?: Record<string, unknown>
+}
+
+export async function addToListmonk(data: SubscriberData): Promise<boolean> {
+  const db = getPool()
+  if (!db) {
+    console.log("[Listmonk] Database not configured, skipping")
+    return false
+  }
+
+  const client = await db.connect()
+  try {
+    const attribs = {
+      ccg: {
+        ...data.attribs,
+        registeredAt: new Date().toISOString(),
+      },
+    }
+
+    // Check if subscriber exists
+    const existing = await client.query(
+      "SELECT id, attribs FROM subscribers WHERE email = $1",
+      [data.email]
+    )
+
+    let subscriberId: number
+
+    if (existing.rows.length > 0) {
+      subscriberId = existing.rows[0].id
+      const mergedAttribs = { ...existing.rows[0].attribs, ...attribs }
+      await client.query(
+        "UPDATE subscribers SET name = $1, attribs = $2, updated_at = NOW() WHERE id = $3",
+        [data.name, JSON.stringify(mergedAttribs), subscriberId]
+      )
+      console.log(
+        `[Listmonk] Updated existing subscriber: ${data.email} (ID: ${subscriberId})`
+      )
+    } else {
+      const result = await client.query(
+        `INSERT INTO subscribers (uuid, email, name, status, attribs, created_at, updated_at)
+         VALUES (gen_random_uuid(), $1, $2, 'enabled', $3, NOW(), NOW())
+         RETURNING id`,
+        [data.email, data.name, JSON.stringify(attribs)]
+      )
+      subscriberId = result.rows[0].id
+      console.log(
+        `[Listmonk] Created new subscriber: ${data.email} (ID: ${subscriberId})`
+      )
+    }
+
+    // Add to Crypto Commons list
+    await client.query(
+      `INSERT INTO subscriber_lists (subscriber_id, list_id, status, created_at, updated_at)
+       VALUES ($1, $2, 'confirmed', NOW(), NOW())
+       ON CONFLICT (subscriber_id, list_id) DO UPDATE SET status = 'confirmed', updated_at = NOW()`,
+      [subscriberId, LISTMONK_LIST_ID]
+    )
+    console.log(`[Listmonk] Added to list ${LISTMONK_LIST_ID}: ${data.email}`)
+
+    return true
+  } catch (error) {
+    console.error("[Listmonk] Error:", error)
+    return false
+  } finally {
+    client.release()
+  }
+}

package.json

@@ -37,7 +37,6 @@
     "@radix-ui/react-toggle": "1.1.1",
     "@radix-ui/react-toggle-group": "1.1.1",
     "@radix-ui/react-tooltip": "1.1.6",
-    "@vercel/analytics": "latest",
     "autoprefixer": "^10.4.20",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -45,6 +44,8 @@
     "date-fns": "4.1.0",
     "embla-carousel-react": "8.5.1",
     "googleapis": "^170.1.0",
+    "nodemailer": "^6.9.0",
+    "pg": "^8.13.0",
     "input-otp": "1.4.1",
     "lucide-react": "^0.454.0",
     "next": "16.0.10",
@@ -65,6 +66,8 @@
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.9",
     "@types/node": "^22",
+    "@types/nodemailer": "^6.4.0",
+    "@types/pg": "^8.11.0",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "postcss": "^8.5",