toJson method

Implementation

@override
Map<String, dynamic> toJson() {
  return {
    '@type': 'updateNewPreCheckoutQuery',
    if (extra != null) '@extra': extra,
    'id': id,
    'sender_user_id': sender_user_id,
    'currency': currency,
    'total_amount': total_amount,
    'invoice_payload': invoice_payload,
    'shipping_option_id': shipping_option_id,
    'order_info': order_info
  };
}