need expert smarty php developer to fix -- 2

-> Task 1 : need to join 2 project registration page (one project is in smarty php and other project is in core php) Both project has registration page. But we need only one registration page on smarty project and need to eliminate registration page from core php project. But from one registration of smarty project is done then it should register on core php automatically. Task2 -> Once user logged in smarty php project then it shouldn't need to again login for using php project. Task3 -> Need to add some affiliate code on sales page and registration page of smarty php project.