# 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.pgecom.com/api-endpoint/ecommerce/invoice.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.