def attributes_for_request(attrs = filled_attributes)
      return attrs if self.class::ORIGIN_TRANSACTION_VARIABLES.empty?

      attrs.each_with_object({}) do |(attr, value), request_attrs|
        request_attrs[self.class::ORIGIN_TRANSACTION_VARIABLES.fetch(attr, attr)] = value
      end
    end
def attributes_for_request(attrs = filled_attributes)
      return attrs if self.class::ORIGIN_TRANSACTION_VARIABLES.empty?

      attrs.each_with_object({}) do |(attr, value), request_attrs|
        request_attrs[self.class::ORIGIN_TRANSACTION_VARIABLES.fetch(attr, attr)] = value
      end
    end
Returns only filled attributes with the original Alpha Card Services
 transaction variables names.

 @param attrs [Hash]
   Attributes that must be converted to AlphaCard request params/
   Default value is <code>filled_attributes</code>.

 @example
   order = AlphaCard::Order.new(id: '1', tax: nil, po_number: 'PO123')
   order.attributes_for_request

   #=> { orderid: '1', ponumber: 'PO123' }