Registered traveller- renewal application

I am a us citizen and have had the program for about a year and a half.

I received an email about a month before it expired last year to renew, so I did for £50.

So does it work the same going into the 3rd year? Or do I have to re apply, pay the initial startup fee, and go though the interview at the border again?

Thanks

Not familiar but maybe the gov.uk website may help?
https://www.gov.uk/registered-traveller