Happy day Vitali ! It is working as your log in Yahoo! or Yahoo similar site. Thanks.

Hi Vitali,

You shouldn't ask user for Yahoo! logon information if what you mean
is user name and password. You will get some kind of token after
you send the user to Yahoo! for their permission and then you can
use that token to access their contacts information.

You can start with the Yahoo! OpenID/OAuth guide to see how the flow
looks like and then decided whether it can satisfy your requirements:
http://developer.yahoo.com/oauth/guide/index.html

Thanks,
Yu Wang
Yahoo! Membership Team

deep, Yu,

Thank you for your insight.
I think I can take my decision just based on that.

Have a nice day.

Vitali