graph TB
linkStyle default fill:#FFF,stroke:#000,stroke-width:1.5px;
classDef cssGrayscale fill:#EEE,fill-opacity:0.5,stroke:#000,stroke-width:1.5px;
classDef cssError fill:#ff0000,fill-opacity:0.5,stroke:#000,stroke-width:1.5px;

    start(Start)
    chkIsProgramIDProvided{URL has a ProgramID?}
    chkIsSigninRequired{URL requires sign-in?}
    chkIsGuestSignedIn{Is guest signed-in?}
    chkProgIDValidForGuest{Valid ProgID for Guest?}
    chkSignInSuccessful{Sign-in Successful?}
    opMLifeSignIn[MLife Sign-In]
    errOfferNotValid[Error: Offer Not Valid]

start-->chkIsProgramIDProvided
chkIsProgramIDProvided-- Yes -->chkIsSigninRequired
chkIsSigninRequired-- Yes -->chkIsGuestSignedIn
chkIsGuestSignedIn-- No --> opMLifeSignIn
opMLifeSignIn --> chkSignInSuccessful
chkSignInSuccessful-- No --> errOfferNotValid
chkIsGuestSignedIn-- Yes --> chkProgIDValidForGuest
chkProgIDValidForGuest -- No --> errOfferNotValid

class start cssGrayscale;
class chkIsProgramIDProvided,chkIsSigninRequired,chkIsGuestSignedIn,chkProgIDValidForGuest,chkSignInSuccessful,opMLifeSignIn cssGrayscale;
class errOfferNotValid cssError;