Fix Taobao API Integration Issues

I already have the Taobao Open Platform wired into my e-commerce site, but several calls are failing and the flow has become unreliable. Your task is to dive into the existing codebase, pinpoint the root causes, and get every endpoint working smoothly again... (Budget: $30 - $250 USD, Jobs: API Integration, JavaScript, MySQL, Node.js, OAuth, PHP, Python, Software Architecture, TaoBao API, Typescript)