Fix Node.js MLM Payout Logic

My Node.js-based MLM platform has already gone live, but the July payout module is mis-calculating commissions. The problem sits squarely in the commission calculations: multiple plans feed into fixed-percentage rewards that must respect individual ranks, downlines, legs, and various payout caps... (Budget: ₹12500 - ₹37500 INR, Jobs: API Development, Backend Development, Database Management, Node.js, PostgreSQL, Software Development)