If anyone has / had the same issue this issues resolution was:
Support response:
You need to set a adview limit.
To create a daily limit enter in how many adviews the ad package should have in total ( AdView Limit ).
http://openx/www/admin/plugins/RevMax/RevMax-packages.php?a=edit&recid=0 RevMax will divide the input by the thirty day subscription and set a overall daily limit.
A value of 100000 would be 3333, adviews daily limit. I higher number would increase the overall daily limit, and a lower number would decrease the clients daily adviews.
Clients answer & question:
That fixed the paypal error message, thank you, but why doesn't it redirect to paypal automatically?
Support Response:
Taken from the instructions:
"Inside " paymentrouter " you will find the forward to payment screen, and can edit as needed. The function begins at line #112.
You can un comment line # 120 //echo
and the user will be forwarded automatically without this intermediate screen.
"
http://openxpayments.com/advertisers-signup/customizing-advertiser-screens-payment-logo's/Hope that helps,
Mike