I'm pretty sure they have an agreement with Second Swing.

Titleist.com/trade-in-program

It is handled thru the Blue Book Program. It explains everything and will give you the value of you club[s].

No but I have had good luck with 2ndswing.com. You will get the best prices by just doing your own listing on a sales site like eBay but if you do not have the time or want the hassle of posting just use 2ndswing or similar places. I have also used a local Golf Mart store when I lived in the San Diego area. They gave decent trade prices.

Yes, if you look near the bottom of the Titleist website under "Explore", you will see the link for Trade In Clubs. When I have been fit on previous occasions, the fitter is the local Titleist rep and I have also traded in through him as well.

They have a partner in NC listed on the Titleist website. . Previously they partnered with 2nd Swing. To the best of my knowledge the buy and sell transactions are separate and independent of each other. The sold piece is not applied directly to the new purchase.
Actually not much different than 2nd Swing or Global Golf. You have to send in the sale item, get a credit issued that you can apply to a later purchase. Can’t buy first and then apply the credit later to that purchase.

See the bottom of this website page in the Explore section...

Also: www.titleist.com/trade-in-program

I used them last year to clear out an old set of irons. Worked seamlessly for me. Not much communication from their end when they received and verified the condition of the clubs, but the check came in a timely manner for the amount they estimated based on the condition of the clubs that I provided prior to shipment.