Redeem a ScoreStarling invitation the user gives you: a friend's invitation link (https://scorestarling.com/r/CODE) or its code, or a beta code. Free for the user: a beta code adds its credits now; an invitation gives the user and their friend credits each after the user's first finished transcription (any kind, free ones included). One invitation and one beta code per account. Call once with the user's code; never guess or reuse codes from elsewhere.