How do I set up Paypal Checkout buttons using Coldfusion?

I am following the instructions here:

https://developer.paypal.com/docs/checkout/integrate/#5-capture-the-transaction

And when I get to step 6.2 to verify the transaction on the server side I am not sure what to do. Do I need to install something on the server if I am using the javascript code shown?

Cheers!