def create destination_account, destination_amount
      payment = Payment.new
      payment.account = account
      payment.destination_account = destination_account.to_s
      payment.destination_amount = Amount.from_string(destination_amount)
      payment
    end
def create destination_account, destination_amount
      payment = Payment.new
      payment.account = account
      payment.destination_account = destination_account.to_s
      payment.destination_amount = Amount.from_string(destination_amount)
      payment
    end
Create a Payment object with some field filled.
 @return [Payment]