modify paypal checkout integration

i have a users area with free sign up. i have placed it on testing server you can see it here: [login to view URL] user - russ1001 pass - test100 the project is to do the following: in the user area there a link "create new image". this link defaults to the free image maker. if user upgrades then this link must point to the paid image maker. i.e on payment the url will change. the paid subscription is for 30 days. after 30 days the link must revert back to free url. - Place the expiration date below "create new image" link. - Prevent user from accessing paid image maker by typing url directly into browser. paypal integration: Place a "Upgrade" link below the "create new image" link. This link goes to paypal checkout. ------------------------------------------- a year ago i added paypal payment per banner. user selects a banner and then proceeds to chekout. (i will not use this method anymore.) you can use these files and modify as needed or create new if easier. This functions perfectly and the db is updated with return call. i have attached the files. some files on the server are encrypted but all files you will need are not encrypted.