Here is the various documentations provided by paypal for use of the paypal integration in the websites.
hope this helps any of you visitors.
I am going to develop using this SDK, hope to post some additional information that i get from this process.
In the following attachment, there is a simple code to illustrate how to use the arrays to submit the form data to a simple php script that generates the form summary to the user upon receipt.
here is the sample code file form and its summary in php