Paul Heyman recently spoke with Richard Deitsch on SI Media Podcast and during the podcast, Heyman explained that his promos are scripted, but only to an extent. He prefers to do his own promos as he feels he needs to react to the live crowd when he’s doing the promo and not just to memorize a script from WWE's creative team. WWE gives him a direction in what he needs to promote and then he'll add his own words to the promo.
“What is being promoted is written for me, in the sense of ‘this is the subject matter you’re talking about.’ Always. What are we promoting here today? We have the Brock Lesnar ‘Go To Hell Tour.’ Am I promoting Brock’s theory of tonight? Yes or no? Am I mentioning the Stone Cold Podcast? Yes or no? I know we’re pushing his Undertaker vs. Brock Lesnar. Am I pushing that this all leads to WrestleMania? Yes or no? What am I promoting here?”
“They learned to stop asking me to do this. What’s your first line? What’s your second line? What’s your third line? What’s your fourth line?…If you’re looking for me to go 1-2-3-4-5, you’re not letting me to feel the live crowd, and you’re asking me to be pigeonhole myself into memorizing a script, and it will not work. I like to interact with the audience."
You can listen to the entire podcast here.