I intend it is something simple.
The visitor inscribes its email in the site, and if to beat with one I number predefined, receives an email to say that profit the money. This email has that to have a paypal.
For example: the email I number 2000 that to enroll itself, it gains 5$. Thus, when a visitor to inscribe its email and will be this numbers, anger to receive the email and later the money will be sent. After to gain the accountant of emails comes back to the 0 and chooses a random number, above of the 5000 (for example).
It does not need back Office. All the configurations, can be directly in the page php. A page only arrives, but it can also use a page for the configuration and another one for the registration. It does not need BD, therefore emails is not kept.
Script simply has that to count the written numbers of emails in the field for the effect and she will be the correspondent to the one of the premio, to send an email for the administrator of the site to indicate who profit to carry through the transference.
Also, all emails that to be enrolled, they receive an email to say if had earned or not.
If a time per day only can inscribe each email.