Some classes and method seem to be missing after upgrading from DW 7 to DW8?

Hi,

I am working on solution which was upgraded from DW7(19.2.9.3) to DW8(8.2.1.2). And I need to build some custom dll's under the new version.

But some of the methods which are used in DW 7 can't be found from DW8?

Fx. NewsLetterV3.NewsLetter, I can no longer find it from DW8 API (http://developer.dynamicweb-cms.com/api8/),

is there anyone here can tell me where to find the NewsLetterV3's API or tell me where to find the methods or classes mentioned below from DW8?

Or are they removed?

NewsLetterV3.NewsletterItem.SaveCategory(newNlGroup.ID, NewsLetterV3.Consts.CategoryType.Email);

Recipient r = new Recipient(user.ID);

r.Unsubscribe(g.ID);

string stPassword = NewsLetterV3.RandomPassword.Generate();

Subscription newSubscription = new Subscription((int )newscatID, Dynamicweb.Modules.Common.Constants . MailFormat.HTML);

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