Online payments are a major part of e-commerce in Bulgaria. With the introduction of the euro from 1 January 2026, all online payment systems must be adapted to work with dual currency - BGN and EUR. This requires technical integration with payment gateways, banking systems and ensuring maximum security.

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Popular payment gateways for dual currency in Bulgaria

The main payment service providers in Bulgaria offer dual currency support:

ePay.bg:

  • Full support for BGN and EUR transactions
  • API integration for automatic currency conversion
  • Support for all popular bank cards
  • Real-time notifications for successful payments
  • Detailed reports in both currencies

Borica:

  • Integration with all Bulgarian banks
  • 3D Secure support for euro transactions
  • API for batch processing of payments
  • Fraud detection systems for dual currency
  • Mobile payments integration

PayPal, Stripe, Square:

  • International platforms with EUR support
  • Advanced API functionalities
  • Subscription billing in both currencies
  • Multi-currency checkout experiences
  • Global fraud protection

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Technical architecture for dual currency

The right technical architecture is the basis for reliable online payments:

Backend architecture:

  • Microservices for foreign exchange operations
  • Database schema for storing double prices
  • API endpoints for BGN and EUR transactions
  • Caching layers for fast currency conversion
  • Message queues for asynchronous processing

Frontend integration:

  • JavaScript SDK for payment processing
  • React/Vue components for checkout forms
  • Real-time currency calculators
  • Progressive web app capabilities for mobile
  • Responsive design for different devices

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Dual currency online payment security

Security is critical when processing payments in two currencies:

Encryption and data protection:

  • TLS 1.3 for all payment communications
  • AES-256 encryption for sensitive data storage
  • Tokenization of bank cards
  • PCI DSS compliance for both currencies
  • GDPR compliance for personal data

Fraud prevention:

  • Machine learning algorithms for detection
  • Geo-location analysis of transactions
  • Behavioral analytics for unusual pattern-and
  • Real-time risk scoring
  • 3D Secure integration for high-risk payments

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API integration for dual currency

Technical integration with payment gateways requires specific API settings:

REST API examples:

javascript// Create a dual currency payment
const payment = {
  amount_bgn: 100.00,
  amount_eur: 51.11,
  currency_primary: "BGN",
  currency_secondary: "EUR",
  exchange_rate: 1.95583,
  customer_id: "customer_123",
  order_id: "order_456"
};

// Webhook to process successful payments
app.post('/webhook/payment-success', (req, res) => {
  const paymentData = req.body;
  // Dual currency processing
  processPaymentInDualCurrency(paymentData);
});

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Testing online payments

Thorough testing is critical to system reliability:

Test scenarios:

  • Successful payments in BGN and EUR
  • Failed payment handling
  • Refund operations in both currencies
  • Partial refunds with currency conversion
  • Timeout scenarios and error handling

Automated testing:

  • Unit tests for payment functions
  • Integration tests with payment gateways
  • Load testing under high load
  • Security penetration testing
  • End-to-end user journey testing

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Reporting and analytics for dual currency

Dual currency payment analytics provide valuable insights:

  • Revenue reporting in BGN and EUR
  • Conversion rate analysis by currencies
  • Customer preferences for BGN vs EUR
  • Payment method performance analytics
  • Seasonal trends in both currencies

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Conclusion

Integrating online payments for dual currency requires careful planning of technical architecture, security and user experience. Successful implementations ensure a smooth checkout process and increase customer confidence.