Question About Using Postback URL

I would like to know your experiences with using postback URLs. I am a PHP programmer, but I want to know how well these work. I am having a horrible time with content lockers from three different companies, meaning that most times the dang content won’t unlock, even after I get to the end of the "survey".
One of my questions about postback URLs is this – Do they convert on the designated action, as in email submit, or do they make you wait until the user goes through all the crap including having to commit to some form of payment on something.
How easy are the incentive offers to use with postback URLs?
When a user completes an offer, how do you handle the integration of what the user sees afterwards? Do you add a "Location" command in the PHP script to send them to some page?
I would appreciate any […]

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