# Superfluid Subscriptions ## Building Subscriptions with Superfluid When building a subscriptions product on Superfluid, we expect that you’ll need a few things 1. You’ll need to enable users to create a subscription stream, update that stream if they change their plan, or delete that stream if they opt to cancel -> our widget offers these features off-the-shelf, check out [Superfluid Checkout Widget](/superfluid/developers/superfluid-subscriptions/superfluid-checkout-widget.md) 2. You may need to validate whether an address is currently streaming to you, and perhaps get a list of all addresses currently streaming to you -> see [Implementing Subscriptions in your App](/superfluid/developers/superfluid-subscriptions/implementing-subscriptions-in-your-app.md#getting-stream-data) 3. You’ll need to know when a user deletes a stream or updates their plan so that you may make the proper changes to their account. -> see [Implementing Subscriptions in your App](/superfluid/developers/superfluid-subscriptions/implementing-subscriptions-in-your-app.md#events) There are many ways that this process can be managed, and your implementation will depend on the needs of your users. With that said, here are a few concepts & code examples that should help you in your development. --- # 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://superfluid.gitbook.io/superfluid/developers/superfluid-subscriptions.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.