How can use multiple web_custom_request in a single transaction

How can use multiple web_custom_request in a single transaction?

I have following services:

1. Login

2. Search

3. Add Address

4. Logout

Each service is correlated with another service. I want to run all this webservices in a single transaction using WEB_CUSTOM_REQUEST.

How can I do the same?

This is my first post, so hope that will get nice and quick reply from experts.