That's it... put it all together and you've got a preference page that's updated with your subscriber record and passes a request to update a boolean field (true/false) in Salesforce.
Yilokho kuphela... lihlanganise konke futhi unekhasi lokuncamelayo elibuyekezwa ngerekhodi lakho lobhalisile bese lidlulisa isicelo sokuvuselela inkambu ye-boolean (eyiqiniso / yamanga) eSalesforce.