public BloxClientBuilder iamCredentials(AWSCredentialsProvider iamCredentials) {
        setIamCredentials(iamCredentials);
        return this;
    }
Specify an implementation of {@link AWSCredentialsProvider} to be used when signing IAM auth'd requests

@param iamCredentials
       the credential provider
@return This object for method chaining.
frontend-service-client/src/main/java/com/amazonaws/blox/BloxClientBuilder.java