# Subscriptions After you subscribe to an API you can find your API Secret on the subscription page along with analytics, pricing and realtime usage information. ## Payments Subscription payments are taken monthly from your account. You can view your current bills and invoices in the account billing section. ## Usage API usage is recorded in realtime. ## Subscription Secret The key used to authenticate you to the API servers. This is usually passed through the Authorisation header, however this depends on the API provider. You should be able to find information on how to use your API through their documentation. {% hint style="warning" %} Your Subscription Secret should be kept safe as it allows you to be charged for your usage of the API. {% endhint %} --- # 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.paypi.dev/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.