You will need to create a new WorldPay script that will place advertisement if the transaction is successful.
1. Send the payment
2. Receive response from WorldPay after the payment is made.
3. Verify the response, if it's good, run few MySQL queries,
if it process fails, an error in the writting of the script and not show the advertisement.
-In the form select the time period as 7 days, 30 days, 90 days or 180 days. Then the customer goes to payment page. (4 different amount)
-In the form select the time period as 1 week, 4 weeks 8 weeks, Type-R or Type-1day. Then the customer goes to payment page. (5 different amount)
-In the form select the time period as longer than 3 weeks. Then the customer goes to payment page. (1 amount)
Anouther type amount of 20 euro, in the form select multiply 1,2,3.... Then the customer goes to payment page.
I prefer to use skype, if we can work at same moment for comunication.