Implementing BayarCash Payment API with Ruby: Validate Checksum

Integrating payment platforms can be challenging, especially when documentation lacks examples in your preferred language. This article details a Ruby on Rails solution for validating BayarCash checksums, a common hurdle for developers working with this Malaysian payment gateway. The official documentation provides a PHP example, but this guide bridges the gap for Ruby developers.

Understanding the PHP Example

BayarCash's PHP checksum generation code is relatively simple: it sorts the payload data by key, concatenates the values with a pipe (|), and generates an HMAC SHA256 checksum. However, directly translating this to Ruby requires careful consideration of data structures and hashing methods.

A Robust Ruby on Rails Solution

The following Ruby code provides a secure and efficient method for validating BayarCash checksums within a Rails application:

# Your BayarcashService class

def valid_checksum?(params)
  received_checksum = params['checksum']

  payload_data = {
    'record_type' => params['record_type'],
    'transaction_id' => params['transaction_id'],
    'exchange_reference_number' => params['exchange_reference_number'],
    'exchange_transaction_id' => params['exchange_transaction_id'],
    'order_number' => params['order_number'],
    'currency' => params['currency'],
    'amount' => params['amount'],
    'payer_name' => params['payer_name'],
    'payer_email' => params['payer_email'],
    'payer_bank_name' => params['payer_bank_name'],
    'status' => params['status'],
    'status_description' => params['status_description'],
    'datetime' => params['datetime']
  }

  sorted_payload = payload_data.sort.to_h
  payload_string = sorted_payload.values.join('|')
  generated_checksum = OpenSSL::HMAC.hexdigest('sha256', SECRET_KEY, payload_string)
  ActiveSupport::SecurityUtils.secure_compare(generated_checksum.downcase, received_checksum.downcase)
rescue => e
  Rails.logger.error "Checksum validation error: #{e.message}"
  false
end

This code addresses key differences between PHP and Ruby:

1. Hash Sorting: Ruby's hash.sort.to_h effectively mirrors PHP's ksort.
2. String Concatenation: The join('|') method efficiently concatenates the sorted payload values.
3. Checksum Generation: OpenSSL::HMAC.hexdigest provides a secure HMAC SHA256 checksum generation.
4. Secure Comparison: ActiveSupport::SecurityUtils.secure_compare prevents timing attacks during checksum verification. Error handling is included for robustness.

Conclusion

This refined Ruby implementation ensures secure and reliable BayarCash checksum validation in your Rails application. This solution streamlines the integration process and enhances the security of your payment processing.

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