public void setUpfrontPaymentAmount(String upfrontPaymentAmount) {
        this.upfrontPaymentAmount = upfrontPaymentAmount;
    }
<p>
The up-front payment amount.
</p>

@param upfrontPaymentAmount
       The up-front payment amount.
aws-java-sdk-savingsplans/src/main/java/com/amazonaws/services/savingsplans/model/SavingsPlan.java