public static AmazonPinpointSMSVoiceAsyncClientBuilder asyncBuilder() {
        return AmazonPinpointSMSVoiceAsyncClientBuilder.standard();
    }
Client for accessing Pinpoint SMS Voice asynchronously. Each asynchronous method will return a Java Future object
representing the asynchronous operation; overloads which accept an {@code AsyncHandler} can be used to receive
notification when an asynchronous operation completes.
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Pinpoint SMS and Voice Messaging public facing APIs
aws-java-sdk-pinpointsmsvoice/src/main/java/com/amazonaws/services/pinpointsmsvoice/AmazonPinpointSMSVoiceAsyncClient.java