# Introduction ## What is Billing.js? Billing.js is a front end component library that allows you to create **professional** **pricing page** and **customer portal** linked to your Stripe by copy/pasting a few lines of code. All the components use TailwindCSS classes so you can customise them to fit your style and you can easily integrate TailwindUI pricing pages. ![](https://2415023427-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fk0DAnFFM0rpMMriidbgN%2Fuploads%2FVprq8RCQfgZu46jthK25%2FScreenshot%202022-02-09%20at%2020.51.34.png?alt=media\&token=121fa621-b7ed-4b1a-aab4-4df496e6a358) --- # 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.billingjs.com/introduction.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.