Automated Stock Monitoring and Checkout App

Objective
Develop an application that monitors specified websites for product stock availability, automatically adds the product to the cart, and completes the checkout process.

Requirements
Key Features
Stock Monitoring

Monitor specific product pages on various e-commerce websites for stock availability.
Notify users when a product is in stock.
Automated Carting

Automatically add the specified product (with size, color, or variant preferences) to the shopping cart upon stock detection.
Automated Checkout

Automatically complete the checkout process using pre-saved user information, including payment and shipping details.
User Interface

The app should simulate a real browser session and work as close to human interaction as possible for the highest success rate.

Provide a simple, user-friendly interface for adding product links, setting preferences, and viewing logs or notifications.
Notifications

Notify users of successful carting and checkout attempts via email or app alerts.
Technical Considerations
Must support multiple websites (common platforms like Shopify, WooCommerce, etc.).
Ensure secure storage of sensitive information (e.g., payment and login credentials).
Operate at high speed to increase success rates for competitive products.
Compliance
Adhere to website terms of service and applicable legal guidelines.
Deliverables
Fully functional application with stock monitoring, automated carting, and checkout capabilities.
User guide or basic documentation.

Additional Notes
Please include in your quote:

Costs for development, testing, and deployment.
Recommendations for hosting or additional infrastructure if required.
Any exclusions or assumptions made in your quote.

The source code for the application will be used internally only and not for resale.