Product Requirements Document: Upsell Products in Cart

1. Introduction/Overview:

This feature adds upsell product recommendations to the shopping cart page and during checkout to increase customer engagement and promote related products. It aims to suggest relevant items that customers might want to add to their order, leading to higher sales and a better user experience.

Goal: To increase sales and customer engagement by providing relevant upsell product recommendations.

2. Goals:

Increase the average order value by 5% within the first month of launch.
Achieve a click-through rate of 2% on upsell product recommendations.
Generate 3% of total revenue from upsell products within the first quarter.

3. User Stories:

As a user who has added a camera to my cart, I want to see recommendations for compatible lenses and tripods so that I can easily purchase everything I need for my photography.
As a guest user viewing the cart page, I want to see relevant product recommendations based on the items in my cart, so I can discover other products I might be interested in purchasing.
As a returning user who previously purchased running shoes, I want to see recommendations for running apparel and accessories on the cart page, so I can easily replenish my running gear.

4. Functional Requirements:

The system must display a maximum of 3 upsell products on the cart page and during checkout.
The system must retrieve upsell products based on one of the following criteria:
- Products frequently bought together with items already in the cart.
- Products recommended based on the user's past purchase history.
For guest users, the system must display upsell products based on the items currently in the cart.
Each upsell product recommendation must display:
- Product image
- Product name
- Product price
- "Add to Cart" button
Clicking the "Add to Cart" button must add the upsell product to the user's cart without redirecting the user away from the cart page.
The system must track click-through rates for each upsell product displayed.
The system must record the revenue generated from each upsell product added to the cart.
The system must handle cases where no suitable upsell products can be found and display a message such as "No recommendations available at this time."

5. Non-Goals (Out of Scope):

Implement cross-sell recommendations on the cart page.
Personalized upsell product selection based on browsing history (only purchase history is considered).
A/B testing different upsell algorithms in the initial release.

6. Design Considerations:

The upsell product recommendations section should be visually appealing and seamlessly integrated into the cart page and checkout flow.
The layout should be responsive and work well on both desktop and mobile devices.
Use clear and concise language for product descriptions and button labels.
Consider using a carousel or slider to display the upsell products if space is limited.
Refer to the existing design system for component styles and branding guidelines. Mockups illustrating the placement of the upsell sections in the shopping cart and checkout page should be provided.

7. Technical Considerations:

The upsell product selection algorithm should be efficient and scalable to handle a large product catalog and user base.
Ensure that the upsell product recommendations are relevant and accurate to avoid frustrating the user.
Consider using a caching mechanism to improve the performance of the upsell product retrieval process.
The feature should integrate seamlessly with the existing e-commerce platform's cart and checkout functionality.
The algorithms may need to be fine-tuned as more data is collected.

8. Success Metrics:

Revenue generated from upsell products.
Click-through rate on upsell product recommendations.
Increase in average order value.
Number of upsell products added to cart per session.
Customer satisfaction (measured through surveys or feedback forms).

9. Open Questions:

What specific data points should be used to determine