open method
Opens the payment gateway with the given URL and parameters
Returns a map containing:
- status: 'success', 'error', or 'cancelled'
- code: Error code or success code
- message: Human-readable message about the result
- response: The raw response from the payment gateway (if available)
Implementation
Future<Map<String, dynamic>?> open(String url, Map<String, dynamic> params) {
throw UnimplementedError('open() has not been implemented.');
}