Trading Card Purchasing Agent Bot

I want a fully-automated buying agent that can locate specific trading card products the moment they appear and complete checkout for me on specialized trading-card sites as well as other mainstream retailers I specify. The script should watch item pages or search results, detect restocks instantly, verify the price is within a threshold I set, and then execute the entire purchase flow—login, add to cart, shipping, and payment—without manual input.

Configurable fields (item URL or keyword, desired quantity, max price, billing/shipping profiles, scheduling) must sit in a simple JSON/YAML file or a small GUI so I can adjust targets quickly between drops. I need accurate status logging, basic error handling, and an optional Discord/webhook ping that confirms each successful order or flags a failure.

You’re free to pick the stack—Python with Selenium/Playwright or Node with Puppeteer are both fine so long as headless execution, proxy support, and captcha-solving hooks are possible. Clean, well-commented code and a short setup guide are the final deliverables; I should be able to run the bot on a Windows PC or Linux VPS with nothing more than the instructions you include.

Acceptance criteria:
• Monitors at least two named specialized trading-card sites plus one additional retailer I provide.
• Consistently checks out a low-stock test item in under 3 seconds from in-stock detection on a staging account.
• Allows me to swap login/payment profiles without code changes.
• Provides a concise log file and a webhook confirmation for each attempt.

If something here is unclear, feel free to flag it early so we can lock down the approach before you dive into coding.