193442 Cron job scripts (8) + paypal

I have installed a php script which I downloaded from the internet that allows visitors to exchange links (the script was programmed by a software company a while ago). It is a link exchange manager which I intent to offer to webmasters for free. Its functions include signing up, submitting urls, accepting/denying invitations, display of google page rank and alexa rank, display of google backlinks, automatic sending e-mails to alert users when 'action is required'. In order to handle these features, the script includes the following php scripts which are supposed to run as cronjobs: accept alexarank checklink google back links google rank not accept pending searchengine Partly, these scripts do not work properly. For example, retrieving alexa rank requires some sort of ID (which I believe to have, since I'm a user/member of alexa's web services). The original script includes such an ID which is out-dated and seems not to work. I do not know how to put in my own. Your task would be to look thru these 8 scripts and to make corrections as necessary. What is more, I would be happy to have my check-out (for a premium membership that I offer) set up with paypal. I am a verified business member of paypal. I hope to find someone who can assist me in setting up my project.