Fix Firebase Referral Commission

The referral flow in my JavaScript-based Firebase back end has stopped rewarding the referrer. A new user can still sign up with a code or link, the record shows in Firestore, yet the commission field in the referrer’s wallet document remains unchanged and no error is thrown... (Budget: ₹12500 - ₹37500 INR, Jobs: Backend Development, Database Management, HTML, JavaScript, Mobile App Development, MySQL, Node.js, PHP)