I have installed version 1.39a and I am going through paypal
registering for 3d secure with cardinal centinel on this link

https://www.paypal-business.co.uk/3Dsecure.asp

There are 2 issues:

1) It does not list zencart 1.39a as an option but it does list version 1.38a (US)

So I have choosen other or should I choose version 1.38a

2) It asks for Custom PayPal Integration
and the options are
  • paypal api soap/nvp

  • paypal flow sdk

  • unknown


As I don't not know which it is I have chosen unknown

Should any of these have an affect on getting registered and setting up zencart with 3d secure.