Google Adwords Dynamic Keyword Script for Wordpress

Knowledge of Google adwords, Wordpress and PHP 1) I need a script that will GRAB the keyword(s) people have searched before clicking on my google Adwords ads - and passing the information to my site so I can DYNAMICALLY update and include that EXACT keyword(s) in my a) headline b) body text. 2) Simple implementation: All I should have to do after you build script or plugin is include something like [dynamic keywords here:default keywordXYZ ] into the body of a post or page and 3) Default Keyword: Needs to include a default keyword variable. Ie. if visitor comes from place on site and no keyword is passed from google then use XYZkeyword that I am able to define on each and every implementation. 4) Definable : (above) I should be able to define a different default keyword manually every time I use the [ ] **5) Fully tested: You must test this on your own blog to ensure working before installing on mine. I don't this to turn into a nightmare project. IMPORTANT: I will shortlist programmers who include 1 or more links to php programming on wordpress blogs of proof of competence. Develop as plugin??? ========================== I am looking to build ongoing relationships with good freelancers. Good Freelancer= Able to follow instruction without handholding, fast, reliable, competent. I have several websites all migrating to Wordpress that need attention. ==========================