# Subscription service This service is being used to sell the subscriptions for the services that users can get in some Envelop dapps. For example, user can buy subscription for Saft. Other services can use this tool for their dapps also. --- # 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://niftsy-protocol-niftsy-1.gitbook.io/niftsy/tutorials/subscription-service.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.