Best Practices

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Development Best Practices

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Planning Your Integration

• Understand your business requirements thoroughly
• Map out user flows and API interactions
• Identify required Xerobi API endpoints
• Plan for scalability and future growth
• Document integration scope and milestones
• Allocate time for testing and iteration

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Environment Setup

• Use separate environments (development, staging, production)
• Implement proper version control (Git)
• Set up CI/CD pipelines for automated testing
• Configure monitoring and logging from day one
• Use environment variables for configuration
• Document setup procedures for your team

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Code Quality Standards

• Follow language-specific style guides
• Implement code reviews for all changes
• Write comprehensive unit and integration tests
• Use static analysis tools (linters, formatters)
• Maintain high test coverage (>80%)
• Document code with clear comments and READMEs

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Documentation Practices

• Keep API documentation up to date
• Document integration decisions and trade-offs
• Create troubleshooting guides for common issues
• Maintain runbooks for deployment and maintenance
• Document API key management procedures
• Share knowledge across your development team

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API Design Principles

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Use Consistent Patterns

• Follow RESTful conventions for resource naming
• Use consistent HTTP methods (GET, POST, PUT, DELETE)
• Implement proper status codes (200, 201, 400, 404, 500)
• Use JSON for all request/response bodies
• Include comprehensive error messages

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Version Your APIs

• Use date-based versioning (YYYY-MM-DD format)
• Maintain backward compatibility within versions
• Provide migration guides for breaking changes
• Deprecate old versions with advance notice
• Support multiple versions simultaneously

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Security Best Practices

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Authentication & Authorization

• Never expose API keys in client-side code
• Use environment variables for key storage
• Rotate keys regularly (every 90 days)
• Implement least-privilege access
• Use separate keys for sandbox and production
• Monitor key usage and unusual activity

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Data Protection

• Always use HTTPS for API communications
• Validate SSL certificates
• Encrypt sensitive data at rest and in transit
• Implement proper input validation
• Use parameterized queries to prevent injection
• Log security events without exposing sensitive data

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Error Handling & Resilience

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Implement Comprehensive Error Handling

class ApiClient {
  async request(endpoint, options = {}) {
    try {
      const response = await fetch(`${this.baseUrl}${endpoint}`, {
        ...options,
        headers: {
          'Authorization': `Bearer ${this.apiKey}`,
          'Xerobi-Version': '2026-01-01',
          ...options.headers
        }
      });

      const data = await response.json();

      if (!response.ok) {
        throw new ApiError(data.error || 'Unknown error', response.status);
      }

      return data;
    } catch (error) {
      // Log error for monitoring
      this.logger.error('API request failed', {
        endpoint,
        error: error.message,
        status: error.status
      });

      throw error;
    }
  }
}

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Implement Retry Logic

• Use exponential backoff for retries
• Implement jitter to prevent thundering herd
• Respect rate limit headers
• Don’t retry on client errors (4xx)
• Use idempotency keys for critical operations
• Set maximum retry attempts

async function retryWithBackoff(operation, maxRetries = 3) {
  let attempt = 0;

  while (attempt <= maxRetries) {
    try {
      return await operation();
    } catch (error) {
      if (!isRetryableError(error) || attempt === maxRetries) {
        throw error;
      }

      const delay = Math.min(1000 * Math.pow(2, attempt), 30000);
      await sleep(delay + Math.random() * 1000); // Add jitter
      attempt++;
    }
  }
}

function isRetryableError(error) {
  return error.status >= 500 || error.code === 'RATE_LIMIT_EXCEEDED';
}

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Performance Optimization

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Efficient API Usage

• Use appropriate request batching where available
• Implement caching for static data
• Use compression for large payloads
• Monitor response times and set timeouts
• Use connection pooling for high-throughput applications
• Implement request deduplication

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Resource Management

class ConnectionPool {
  constructor(maxConnections = 10) {
    this.maxConnections = maxConnections;
    this.activeConnections = 0;
    this.queue = [];
  }

  async acquire() {
    if (this.activeConnections < this.maxConnections) {
      this.activeConnections++;
      return this.createConnection();
    }

    return new Promise((resolve) => {
      this.queue.push(resolve);
    });
  }

  release(connection) {
    this.activeConnections--;

    if (this.queue.length > 0) {
      const resolve = this.queue.shift();
      this.activeConnections++;
      resolve(this.createConnection());
    }
  }
}

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Webhook Implementation

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Secure Webhook Handling

• Always verify webhook signatures
• Use HTTPS endpoints only
• Implement idempotency using event IDs
• Process webhooks asynchronously
• Return 200 status quickly to prevent retries
• Store events for debugging and audit

const crypto = require('crypto');

function verifyWebhookSignature(payload, signature, secret) {
  const expectedSignature = crypto
    .createHmac('sha256', secret)
    .update(JSON.stringify(payload), 'utf8')
    .digest('hex');

  return crypto.timingSafeEqual(
    Buffer.from(signature),
    Buffer.from(expectedSignature)
  );
}

app.post('/webhooks/hixbe', express.raw({ type: 'application/json' }), (req, res) => {
  const signature = req.headers['x-hixbe-signature'];

  if (!verifyWebhookSignature(req.body, signature, process.env.WEBHOOK_SECRET)) {
    return res.status(401).json({ error: 'Invalid signature' });
  }

  // Process webhook asynchronously
  processWebhook(req.body).catch(console.error);

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

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Testing Strategies

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Comprehensive Testing

• Test in sandbox environment first
• Use realistic test data
• Test error scenarios and edge cases
• Implement integration tests
• Test webhook endpoints thoroughly
• Monitor test coverage
• Automate testing in CI/CD pipeline

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Test Data Management

const testData = {
  validPayment: {
    amount: 1000,
    currency: 'USD',
    description: 'Test payment'
  },

  invalidPayment: {
    amount: -100, // Invalid amount
    currency: 'INVALID',
    description: ''
  },

  edgeCases: {
    maximumAmount: { amount: 99999999, currency: 'USD' },
    minimumAmount: { amount: 1, currency: 'USD' },
    longDescription: { amount: 1000, currency: 'USD', description: 'A'.repeat(1000) }
  }
};

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Monitoring & Observability

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Implement Comprehensive Logging

• Log all API requests and responses
• Include correlation IDs for request tracing
• Monitor error rates and latency
• Set up alerts for critical issues
• Use structured logging (JSON format)
• Implement log aggregation and analysis

class Logger {
  log(level, message, context = {}) {
    const logEntry = {
      timestamp: new Date().toISOString(),
      level,
      message,
      correlationId: context.correlationId || generateId(),
      ...context
    };

    console.log(JSON.stringify(logEntry));

    // Send to monitoring service
    if (level === 'error') {
      this.monitoring.alert(logEntry);
    }
  }

  info(message, context) { this.log('info', message, context); }
  error(message, context) { this.log('error', message, context); }
  warn(message, context) { this.log('warn', message, context); }
}

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Key Metrics to Monitor

• API response times (p50, p95, p99)
• Error rates by endpoint
• Rate limit usage
• Webhook delivery success rates
• Resource utilization
• Business metrics (conversion rates, etc.)

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Code Organization

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Maintainable Architecture

• Separate concerns (API client, business logic, data access)
• Use dependency injection
• Implement proper error boundaries
• Write comprehensive documentation
• Use consistent naming conventions
• Implement proper code reviews

// Good: Separated concerns
class PaymentService {
  constructor(apiClient, logger, metrics) {
    this.apiClient = apiClient;
    this.logger = logger;
    this.metrics = metrics;
  }

  async processPayment(paymentData) {
    const correlationId = generateId();

    this.logger.info('Processing payment', { correlationId, amount: paymentData.amount });

    try {
      const result = await this.apiClient.createPaymentIntent(paymentData);
      this.metrics.increment('payment.success');
      return result;
    } catch (error) {
      this.metrics.increment('payment.error');
      this.logger.error('Payment failed', { correlationId, error: error.message });
      throw error;
    }
  }
}

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Deployment Practices

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Safe Deployment

• Use feature flags for gradual rollouts
• Implement canary deployments
• Have rollback plans ready
• Monitor deployments closely
• Test in staging environment
• Schedule deployments during low-traffic periods

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Configuration Management

• Use environment-specific configurations
• Store secrets securely (not in code)
• Validate configuration on startup
• Document all configuration options
• Use configuration as code
• Implement configuration drift detection

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Compliance & Legal

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Data Protection

• Comply with GDPR, CCPA, and other privacy regulations
• Implement proper data retention policies
• Obtain user consent for data collection
• Provide data export/deletion capabilities
• Conduct regular security audits
• Document data processing activities

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Business Continuity

• Implement disaster recovery plans
• Regular backup testing
• Monitor system health continuously
• Have incident response procedures
• Maintain service level agreements
• Communicate transparently during outages

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