public class UserCreatedEvent extends Event {

    private String userId;

    private String firstName;

    private String lastName;

}

​

public class UserContactAddedEvent extends Event {

    private String contactType;

    private String contactDetails;

}

​

public class UserContactRemovedEvent extends Event {

    private String contactType;

    private String contactDetails;

}

​

public class UserAddressAddedEvent extends Event {

    private String city;

    private String state;

    private String postCode;

}

​

public class UserAddressRemovedEvent extends Event {

    private String city;

    private String state;

    private String postCode;

}

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