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Learn how to build a complete event ticketing platform using Yabetoo. This guide covers ticket sales, multiple ticket types, capacity management, and attendee check-in.

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Overview

Event ticketing platforms need to handle:
  • Multiple ticket types and pricing tiers
  • Early bird and promotional pricing
  • Capacity limits and sold-out management
  • QR code ticket generation
  • Attendee check-in and validation
  • Refund processing

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Architecture

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Implementation

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1. Event and Ticket Setup

Define your event structure: 
// event-types.ts
interface Event {
  id: string;
  name: string;
  description: string;
  venue: string;
  date: Date;
  endDate?: Date;
  imageUrl: string;
  organizerId: string;
  status: 'draft' | 'published' | 'soldout' | 'completed' | 'cancelled';
  ticketTypes: TicketType[];
}

interface TicketType {
  id: string;
  eventId: string;
  name: string;
  description: string;
  price: number;
  quantity: number;
  sold: number;
  maxPerOrder: number;
  salesStart: Date;
  salesEnd: Date;
  benefits: string[];
}

// Example event
const sampleEvent: Event = {
  id: 'evt_concert_2024',
  name: 'Afrobeats Night 2024',
  description: 'The biggest Afrobeats concert of the year',
  venue: 'Palais des Congrès, Brazzaville',
  date: new Date('2024-12-31T20:00:00'),
  imageUrl: '/events/afrobeats-2024.jpg',
  organizerId: 'org_123',
  status: 'published',
  ticketTypes: [
    {
      id: 'tt_vip',
      eventId: 'evt_concert_2024',
      name: 'VIP',
      description: 'Front row seats with backstage access',
      price: 50000,
      quantity: 100,
      sold: 45,
      maxPerOrder: 4,
      salesStart: new Date('2024-10-01'),
      salesEnd: new Date('2024-12-30'),
      benefits: ['Front row seats', 'Backstage access', 'Meet & greet', 'Free drinks']
    },
    {
      id: 'tt_standard',
      eventId: 'evt_concert_2024',
      name: 'Standard',
      description: 'General admission',
      price: 15000,
      quantity: 500,
      sold: 320,
      maxPerOrder: 10,
      salesStart: new Date('2024-10-01'),
      salesEnd: new Date('2024-12-30'),
      benefits: ['General admission', 'Standing area']
    },
    {
      id: 'tt_early',
      eventId: 'evt_concert_2024',
      name: 'Early Bird',
      description: 'Limited early bird pricing',
      price: 10000,
      quantity: 200,
      sold: 200, // Sold out
      maxPerOrder: 5,
      salesStart: new Date('2024-09-01'),
      salesEnd: new Date('2024-09-30'),
      benefits: ['General admission', 'Early entry']
    }
  ]
};

​
2. Ticket Purchase Flow

Handle ticket orders: 
import Yabetoo from '@yabetoo/sdk-js';
import { v4 as uuidv4 } from 'uuid';

const yabetoo = new Yabetoo(process.env.YABETOO_SECRET_KEY!);

interface OrderItem {
  ticketTypeId: string;
  quantity: number;
}

interface Order {
  id: string;
  eventId: string;
  items: OrderItem[];
  totalAmount: number;
  buyerInfo: {
    firstName: string;
    lastName: string;
    email: string;
    phone: string;
  };
  status: 'pending' | 'paid' | 'cancelled' | 'refunded';
  paymentIntentId?: string;
  createdAt: Date;
}

async function createTicketOrder(
  eventId: string,
  items: OrderItem[],
  buyerInfo: Order['buyerInfo']
) {
  const event = await db.events.findById(eventId);
  if (!event) throw new Error('Event not found');

  // Validate availability
  for (const item of items) {
    const ticketType = event.ticketTypes.find(t => t.id === item.ticketTypeId);
    if (!ticketType) throw new Error(`Ticket type ${item.ticketTypeId} not found`);

    const available = ticketType.quantity - ticketType.sold;
    if (item.quantity > available) {
      throw new Error(`Only ${available} tickets available for ${ticketType.name}`);
    }

    if (item.quantity > ticketType.maxPerOrder) {
      throw new Error(`Maximum ${ticketType.maxPerOrder} tickets per order for ${ticketType.name}`);
    }

    // Check sales period
    const now = new Date();
    if (now < ticketType.salesStart || now > ticketType.salesEnd) {
      throw new Error(`Sales not open for ${ticketType.name}`);
    }
  }

  // Calculate total
  const totalAmount = items.reduce((sum, item) => {
    const ticketType = event.ticketTypes.find(t => t.id === item.ticketTypeId)!;
    return sum + (ticketType.price * item.quantity);
  }, 0);

  // Create order
  const order: Order = {
    id: uuidv4(),
    eventId,
    items,
    totalAmount,
    buyerInfo,
    status: 'pending',
    createdAt: new Date()
  };

  // Reserve tickets temporarily (15 min hold)
  await reserveTickets(order);

  // Create payment intent
  const intent = await yabetoo.payments.create({
    amount: totalAmount,
    currency: 'XAF',
    description: `Tickets for ${event.name}`,
    metadata: {
      orderId: order.id,
      eventId,
      eventName: event.name,
      eventDate: event.date.toISOString(),
      ticketDetails: JSON.stringify(items),
      buyerEmail: buyerInfo.email,
      buyerPhone: buyerInfo.phone,
      type: 'event_ticket'
    }
  });

  order.paymentIntentId = intent.id;
  await db.orders.create(order);

  return { order, paymentIntent: intent };
}

​
3. QR Code Ticket Generation

Generate unique QR codes for each ticket: 
import QRCode from 'qrcode';
import crypto from 'crypto';

interface Ticket {
  id: string;
  orderId: string;
  eventId: string;
  ticketTypeId: string;
  ticketTypeName: string;
  holderName: string;
  qrCode: string;
  qrCodeData: string;
  status: 'valid' | 'used' | 'cancelled';
  usedAt?: Date;
}

async function generateTickets(order: Order, event: Event): Promise<Ticket[]> {
  const tickets: Ticket[] = [];

  for (const item of order.items) {
    const ticketType = event.ticketTypes.find(t => t.id === item.ticketTypeId)!;

    for (let i = 0; i < item.quantity; i++) {
      const ticketId = `TKT-${Date.now()}-${crypto.randomBytes(4).toString('hex').toUpperCase()}`;

      // Create secure QR code data
      const qrData = {
        ticketId,
        eventId: event.id,
        ticketTypeId: item.ticketTypeId,
        timestamp: Date.now(),
        signature: crypto
          .createHmac('sha256', process.env.TICKET_SECRET!)
          .update(`${ticketId}:${event.id}`)
          .digest('hex')
      };

      const qrCodeData = JSON.stringify(qrData);
      const qrCodeImage = await QRCode.toDataURL(qrCodeData, {
        width: 300,
        margin: 2,
        color: { dark: '#001C6B', light: '#FFFFFF' }
      });

      const ticket: Ticket = {
        id: ticketId,
        orderId: order.id,
        eventId: event.id,
        ticketTypeId: item.ticketTypeId,
        ticketTypeName: ticketType.name,
        holderName: `${order.buyerInfo.firstName} ${order.buyerInfo.lastName}`,
        qrCode: qrCodeImage,
        qrCodeData,
        status: 'valid'
      };

      tickets.push(ticket);
    }
  }

  // Save tickets to database
  await db.tickets.createMany(tickets);

  return tickets;
}

​
4. Webhook Handler

Process ticket purchases: 
app.post('/webhooks/yabetoo', async (req, res) => {
  const event = req.body;

  if (event.type === 'payment_intent.succeeded') {
    const { metadata } = event.data;

    if (metadata.type === 'event_ticket') {
      const order = await db.orders.findById(metadata.orderId);

      // Update order status
      await db.orders.update(order.id, { status: 'paid' });

      // Confirm ticket reservations
      await confirmTicketReservations(order);

      // Update sold count
      for (const item of order.items) {
        await db.ticketTypes.incrementSold(item.ticketTypeId, item.quantity);
      }

      // Generate tickets
      const eventData = await db.events.findById(order.eventId);
      const tickets = await generateTickets(order, eventData);

      // Send tickets to buyer
      await sendTicketsByEmail(order.buyerInfo.email, tickets, eventData);
      await sendTicketsBySMS(order.buyerInfo.phone, tickets, eventData);

      // Check if event is sold out
      await checkSoldOutStatus(order.eventId);
    }
  }

  if (event.type === 'payment_intent.failed') {
    const { metadata } = event.data;

    if (metadata.type === 'event_ticket') {
      // Release reserved tickets
      await releaseTicketReservations(metadata.orderId);
      await db.orders.update(metadata.orderId, { status: 'cancelled' });
    }
  }

  res.json({ received: true });
});

​
5. Ticket Validation (Check-in)

Validate tickets at the event entrance: 
interface ValidationResult {
  valid: boolean;
  ticket?: Ticket;
  message: string;
  ticketType?: string;
}

async function validateTicket(qrCodeData: string): Promise<ValidationResult> {
  try {
    const data = JSON.parse(qrCodeData);

    // Verify signature
    const expectedSignature = crypto
      .createHmac('sha256', process.env.TICKET_SECRET!)
      .update(`${data.ticketId}:${data.eventId}`)
      .digest('hex');

    if (data.signature !== expectedSignature) {
      return { valid: false, message: 'Invalid ticket signature' };
    }

    // Find ticket
    const ticket = await db.tickets.findById(data.ticketId);

    if (!ticket) {
      return { valid: false, message: 'Ticket not found' };
    }

    if (ticket.status === 'used') {
      return {
        valid: false,
        ticket,
        message: `Ticket already used at ${ticket.usedAt?.toLocaleString()}`
      };
    }

    if (ticket.status === 'cancelled') {
      return { valid: false, ticket, message: 'Ticket has been cancelled' };
    }

    // Mark as used
    await db.tickets.update(ticket.id, {
      status: 'used',
      usedAt: new Date()
    });

    return {
      valid: true,
      ticket,
      message: 'Ticket validated successfully',
      ticketType: ticket.ticketTypeName
    };
  } catch (error) {
    return { valid: false, message: 'Invalid QR code format' };
  }
}

// Check-in API endpoint
app.post('/api/check-in', async (req, res) => {
  const { qrCodeData } = req.body;
  const result = await validateTicket(qrCodeData);
  res.json(result);
});

​
6. Refund Processing

Handle ticket refunds: 
async function processRefund(orderId: string, reason: string) {
  const order = await db.orders.findById(orderId);

  if (order.status !== 'paid') {
    throw new Error('Order is not eligible for refund');
  }

  const event = await db.events.findById(order.eventId);

  // Check refund policy (e.g., no refunds 48 hours before event)
  const hoursUntilEvent = (event.date.getTime() - Date.now()) / (1000 * 60 * 60);
  if (hoursUntilEvent < 48) {
    throw new Error('Refunds not available within 48 hours of event');
  }

  // Cancel all tickets
  await db.tickets.updateMany(
    { orderId },
    { status: 'cancelled' }
  );

  // Release ticket inventory
  for (const item of order.items) {
    await db.ticketTypes.decrementSold(item.ticketTypeId, item.quantity);
  }

  // Create disbursement for refund
  const disbursement = await yabetoo.disbursements.create({
    amount: order.totalAmount,
    currency: 'XAF',
    firstName: order.buyerInfo.firstName,
    lastName: order.buyerInfo.lastName,
    paymentMethodData: {
      type: 'momo',
      momo: {
        msisdn: order.buyerInfo.phone,
        country: 'cg',
        operatorName: 'mtn' // Detect from original payment
      }
    }
  });

  // Update order
  await db.orders.update(orderId, {
    status: 'refunded',
    refundReason: reason,
    refundId: disbursement.id
  });

  // Notify buyer
  await sendRefundConfirmation(order.buyerInfo.email, order, disbursement);

  return disbursement;
}

​
Ticket Purchase Flow

1

Browse Events

User browses available events and selects one.
2

Select Tickets

User chooses ticket type and quantity.
3

Enter Details

User provides contact information (name, email, phone).
4

Payment

User pays via mobile money (MTN or Airtel).
5

Receive Tickets

User receives QR code tickets via email and SMS.
6

Event Day

User presents QR code at venue for scanning and entry.

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Best Practices

Hold tickets for 15 minutes during checkout to prevent overselling.
Use cryptographic signatures on QR codes to prevent counterfeiting.
Support offline ticket validation with periodic sync for remote venues.
Send alerts to organizers when tickets are 80%, 95%, and 100% sold.

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Email Template Example

const ticketEmailTemplate = (buyer: any, tickets: Ticket[], event: Event) => `
  <h1>Your Tickets for ${event.name}</h1>
  <p>Dear ${buyer.firstName},</p>
  <p>Thank you for your purchase! Here are your tickets:</p>

  <div style="background: #f5f5f5; padding: 20px; margin: 20px 0;">
    <h2>${event.name}</h2>
    <p><strong>Date:</strong> ${event.date.toLocaleDateString()}</p>
    <p><strong>Venue:</strong> ${event.venue}</p>
    <p><strong>Tickets:</strong> ${tickets.length}</p>
  </div>

  ${tickets.map(ticket => `
    <div style="border: 1px solid #ddd; padding: 15px; margin: 10px 0;">
      <h3>${ticket.ticketTypeName}</h3>
      <p>Ticket ID: ${ticket.id}</p>
      <img src="${ticket.qrCode}" alt="QR Code" width="200" />
    </div>
  `).join('')}

  <p>Present this QR code at the entrance for entry.</p>
`;

Disbursements

Process refunds to customers

Webhooks

Handle payment notifications