Any and all input on this would be great.

I have multiple Modules on a site. That I am looking for one check out module or utility to use to be the conductor of my website orchestra of modules :)

If that is not tough enough I also have multiple sub-domain portals that need a check out utility as well that can control the return url trip.

Sort of like a Gateway to my paypal account. If I understand the IPN certain data can be sent to designate return information on the return trip that is sent back to the site.

Then the return URL will lead to the gateway controlling the flow of return traffic to the designated location the person needs to return to. giving you a seamless transaction from start to finish. 

Is this possible to achieve or impossible. i am wondering if there is anything out there that I can use to achieve this to achieve my opis if you will.:)

Thanks much to all Any and all input would be great to have on this as I seem to have met with a brick wall on this until I get some input. 

PEACE :)

Catalook was the best fit for what I was doing. if anyone ever wishes to know that it what I settled on at Snowcoverd.com