Braintree payment integration for v4

Braintree is supposed to be a built in feature of X-Cart but it didn't work so X-Cart advised me to buy this Module to make it work. I bought the mod and had it installed and Braintree still doesn't work. X-Cart has now given me a quote of $1,500.00 for them to do custom work to make this module actually work the way it's supposed to.