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# Maxio Advanced Billing
>
Maxio Advanced Billing (formerly Chargify) provides an HTTP-based API that conforms to the principles of REST.
One of the many reasons to use Advanced Billing is the immense feature set and [client libraries](page:development-tools/client-libraries).
The Maxio API returns JSON responses as the primary and recommended format, but XML is also provided as a backwards compatible option for merchants who require it.
## Steps to make your first Maxio Advanced Billing API call
1. [Sign-up](https://app.chargify.com/signup/maxio-billing-sandbox) or [log-in](https://app.chargify.com/login.html) to your [test site](https://maxio.zendesk.com/hc/en-us/articles/24250712113165-Testing-Overview) account.
2. [Setup authentication](https://maxio.zendesk.com/hc/en-us/articles/24294819360525-API-Keys) credentials.
3. [Submit an API request and verify the response](page:development-tools/client-libraries#make-your-first-maxio-advanced-billing-api-request).
5. Test the Advanced Billing [integrations](https://www.maxio.com/integrations).
Next, you can explore [authentication methods](page:introduction/authentication), [basic concepts](page:introduction/basic-concepts/connected-sites) for interacting with Advanced Billing via the API, and the entire set of [application-based documentation](https://docs.maxio.com/hc/en-us) to aid in your discovery of the product.
### Request Example
The following example uses the curl command-line tool to make an API request.
**Request**
curl -u <api_key>:x -H Accept:application/json -H Content-Type:application/json https://acme.chargify.com/subscriptions.json
Authentication
- Basic Authentication
## Docs
- [Overview](https://developers.maxio.com/http/getting-started/overview) : <!doctype html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Landing Page</title><link rel="stylesheet" href="https://fonts.
- [How to Get Started](https://developers.ma