Requirements of PayPal Pro for Dynamic EOT

I am setting up S2member for a scientific society. So far I am very impressed with S2member’s capabilities. Even though I have been a web developer for many many years it is fantastic to see that people without coding skills can still use the plugin easily. Very nice!

Anyway, I am running into a problem. We want to purchase the S2 member Pro addon to make the registration process easier for our members. We want to use the Pro forms for the registration. Secondly I want to set the EOT dynamically to the 31st of december of the current year. I found a couple forum posts that are very handy, especially this one: Date based EOT instead of fixed duration

What I cannot determine however is if Paypal Pro is required to work with dynamic “rp” and “rt” values. Will this work with Paypal Express?

Is there anyone that can comment on this? Your input will be very much appreciated!

I used the following line to set an EOT

update_user_option( $user_id, 's2member_auto_eot_time', $expire_on );