> For the complete documentation index, see [llms.txt](https://docs.pgecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pgecom.com/api-endpoint/ecommerce/invoice.md).

# Invoice

Categories serve as a fundamental organizational tool, enabling you to systematically classify and present your products to users.

This feature empowers you to create distinct groupings based on common themes, characteristics, or attributes, offering a structured and intuitive way for customers to navigate through your diverse product range.

Through the strategic implementation of categories, you can enhance the user's journey by providing a well-defined framework for exploration.

Users can easily locate and browse products within specific themes or genres, facilitating a more seamless and personalized shopping experience. 

By combining the power of categories with collections, you create a comprehensive system that optimizes product discovery, fostering user engagement and satisfaction within your online store.