public AwsIamConfig withSigningRegion(String signingRegion) {
        setSigningRegion(signingRegion);
        return this;
    }
<p>
The signing Amazon Web Services Region for IAM authorization.
</p>

@param signingRegion
       The signing Amazon Web Services Region for IAM authorization.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-appsync/src/main/java/com/amazonaws/services/appsync/model/AwsIamConfig.java