docs: def amount_object_to_dict(self, amount):
          """Return the dictionary representation of an Amount object.
  
          Amount object must have amount and currency properties and as_tuple method which will return (currency, amount)
          and as_quantized method to quantize amount property.
  
          :param amount: instance of Amount object
  
          :return: dict with amount and currency keys.
          """
          currency, amount = (
              amount.as_quantized(digits=2).as_tuple()
              if not isinstance(amount, dict)
              else (amount["currency"], amount["amount"])
          )
          if currency not in self.currencies:
              raise ValueError(self.err_unknown_currency.format(currency=currency))
          return {
              "amount": str(amount),
              "currency": str(currency),
          }