Automated Checkout Tool Development

Looking for an experienced developer to build an automated checkout tool (request-based preferred) for online stores. Target sites: - Shopify stores - BASE (thebase.in) shops in Japan - Several other Japanese e-commerce sites (details shared after discussion) Requirements: - Proven experience building checkout automation / web automation tools - Experience handling captcha, queue systems and bot protection (Cloudflare, Akamai, etc.) - Support for proxies (Japanese residential IPs), multiple profiles and tasks - Familiar with Japanese address/phone formats and payment flows is a big plus - Clean, documented code. Source code must be pushed to my GitHub repo Project structure: - Start with ONE module (Shopify) as a paid trial milestone - If successful, continue with BASE and Japanese sites as separate milestones - Ongoing monthly maintenance contract available for the right developer Please include in your proposal: - Examples of similar tools you have built (demo/video if possible) - Your estimated price and timeline for the Shopify module - Your maintenance pricing