Best Reliable Way to Get the Actual Selling Price of AliExpress Products (Final Price for Buyers)?

The developer is building a tool to track real-time selling prices of products on AliExpress, but is facing inconsistencies between listed prices and actual prices at checkout. The goal is to find a reliable method to fetch the final price that reflects what users actually pay. The developer has explored the AliExpress Open Platform (Affiliate API), but it doesn't always reflect location-based final prices or coupons. Web scraping with user simulation via Puppeteer/Playwright can load dynamic content, but feels fragile and possibly against terms of service. Third-party pricing APIs or proxies that cache regional pricing are also being considered. Intercepting XHR/API calls in browser DevTools to find internal price endpoints is another option. The ideal solution would programmatically obtain the final checkout price for a product URL with country/currency as input. The solution should also apply AliExpress deals and seller coupons in real-time and be able to process multiple products via API or script. The developer is seeking tips, libraries, or configurations that could help simulate a full buyer session or access internal endpoints reliably. Anyone with experience in this area is encouraged to share their knowledge.