I have done a script that is similar to text-link-ads.com even if not exactly a clone. All payments (pay for links, refund, payment of invoices and all the rest) could be done with Paypal (you can use TEST mode to test the script with the sandbox). You can test the script at the url below: http://www.scriptidea.net/textad/index.php buyer account: buyer01/buyer01 publisher account: publish01/publish01 admin panel http://www.scriptidea.net/textad/admin.php user: admin / pass: admin Regards