Fix Trendloto Bugs & Integrate Payments

I need an experienced web developer to tidy up Trendloto.com.tr. The game engine already works, yet the site shows visible errors and feels sluggish, so your first task is to track down and eliminate those issues while tightening any security gaps you uncover along the way.

Once the platform is stable, I want to introduce a payment flow that lets players make “Tek seferlik üyelik veya abonelik ödemesi” exclusively through “Kredi veya banka kartı ile ödeme”. No other payment options are required for now, but the code should stay modular in case we expand later.

Deliverables
• Diagnose and fix all front-end and back-end errors that currently impact speed or break the interface
• Patch any security vulnerabilities uncovered during the audit
• Optimise page-load times without altering core game logic
• Add a reliable card-based gateway that processes one-off membership or subscription payments, complete with success / failure callbacks and admin-side reporting
• Supply concise setup notes and a summary of changes so future maintenance is straightforward

Stable, fast, and ready to accept card payments—that’s the finish line.