public void setRegistrationId(String registrationId) {
        this.registrationId = registrationId;
    }
<p>
The unique identifier for the registration.
</p>

@param registrationId
       The unique identifier for the registration.
aws-java-sdk-pinpointsmsvoicev2/src/main/java/com/amazonaws/services/pinpointsmsvoicev2/model/CreateRegistrationResult.java