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24 October 2026

Universal online cart implementation

Implementing a universal online cart with open standards for a seamless shopping experience across merchants

Universal online cart implementation

The concept of a universal online cart has been gaining traction in recent years, with many merchants and developers exploring ways to create a seamless shopping experience across different platforms. One approach to achieving this is by using product data, OAuth, and a modular checkout API.

By leveraging these technologies, developers can create a universal cart that allows users to add products from multiple merchants and checkout in a single, streamlined process. This approach also enables cross-merchant aggregation, where products from different merchants can be aggregated and presented to the user in a single interface.

Implementing Cross-Merchant Aggregation

To implement cross-merchant aggregation, developers need to ensure that product data is normalized and consistent across different merchants. This can be achieved by using product data, which provides a standardized vocabulary for describing products and their attributes.

Additionally, developers need to implement price and stock normalization to ensure that prices and stock levels are accurately reflected across different merchants. This can be achieved by using APIs and data feeds to retrieve and update product information in real-time.

Ensuring PCI and Privacy Compliance

When implementing a universal online cart, it is essential to ensure that the solution is PCI and privacy compliant. This can be achieved by using secure payment gateways and tokenization services to protect sensitive payment information.

Developers should also implement anti-friction UX patterns to minimize the risk of cart abandonment and ensure a seamless checkout experience. This can be achieved by using techniques such as OAuth and JSON Web Tokens to authenticate and authorize users.

Modular Checkout API

A modular checkout API is essential for creating a universal online cart that can be easily integrated with different merchants and platforms. The API should provide a standardized interface for processing payments and retrieving product information.

By using a modular checkout API, developers can create a universal cart that is flexible and scalable, and can be easily extended to support new merchants and payment gateways. This approach also enables anti-friction UX patterns to be implemented, such as one-click checkout and guest checkout.

Author

Beatrice Mitchell

Beatrice Mitchell, Manchester-rooted and classically elegant, famously commissioned a rebuttal series after a controversial council planning meeting in Stockport, insisting on community testimony. Holds a firm editorial line on accountability and narrative fairness, and collects vintage city planning maps as an idiosyncratic hobby.