A simple loan implemented in FCL

loan.s

global account issuer = 'CssRnWaxBhRRwhVL7ESgXkP7cgZ9vjFzV5nmr4jj3ZAh';
global account borrower = 'vVVq8PMEa9qGLL7LEmHUZKM78ze5JUgDPnjSE6FES63';
global assetFrac2 asset_ = 'HjdMu5LtF7BW6pGzvZGsV7ABUA4dkZFB2TmXQiymNpue';
global fixed2 interest= 0.05f;
global fixed2 principal;
global fixed2 payout;

global datetime maturityDate = "2018-03-08T10:12:00+00:00";

transition initial -> amountConfirmed;
transition amountConfirmed -> amountTransferred;
transition amountTransferred -> terminal;

@initial
propose(fixed2 ask) {
   if((sender() == issuer)) {
    principal  = ask;
    transitionTo(:amountConfirmed);
  };

}


@amountConfirmed
loan() {
   if((sender() == issuer)){
    transferHoldings(issuer, asset_, principal, borrower);
    transitionTo(:amountTransferred);
  };    
}


@amountTransferred
settle(){
  after(maturityDate) {
    if((sender() == issuer)){
      if((isBusinessDayUK(now()))){
        payout = (principal + (principal * interest));
        transferHoldings(issuer, asset_, payout, borrower);
        transitionTo(:terminal);
      };
    };
  };
}