# REST API Our API enables full integration with the entire OPT Smart Fulfillment system, providing unrestricted access to all its features. It is the ideal solution for customers seeking to automate their operational processes and eliminate manual intervention. ## Key Features ✅ **Print what ever you want:** Send to custom print orders where you can define all prints and customizations during the order submission process. ✅ **Easy order submission of existing products:** Send the orders for predefined products just by using ean13. ✅ **Manage your product portfolio:** Get all information about your existing products, including previews and stock level information. ✅ **Master your shipping:** You are the one who decides what shipping will be used for each order. You can also include your own shipping labels. --- # 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.optondemand.com/integrations-and-apps/rest-api.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.