> This page is for Documentation, version Integration guides (default).
> For other versions, use one of these documentation indexes:
> - Integration guides (default): https://avalara.ferndocs.com/docs/integration-guides/llms.txt
> - Refactor guides: https://avalara.ferndocs.com/docs/refactor-guides/llms.txt
> - Get certified: https://avalara.ferndocs.com/docs/get-certified/llms.txt
> - Agent to Agent (A2A): https://avalara.ferndocs.com/docs/agent-to-agent-a2a/llms.txt
> - AI use cases: https://avalara.ferndocs.com/docs/ai-use-cases/llms.txt
> - API versioning: https://avalara.ferndocs.com/docs/api-versioning/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://avalara.ferndocs.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://avalara.ferndocs.com/_mcp/server.

# Build

Guide: AvaTax Excise

Learn about authentication methods and environments in AvaTax Excise (ATE).

This 1st task describes authenticating in AvaTax Excise (ATE) along with the available authentication methods. It also provides information about ATE's 2 environments: [Sandbox](https://excisesbx.avalara.com/) and [Production](https://excise.avalara.com/).

> **Note**
>
> Part of the **AvaTax Excise** integration guide. [Open the full "Build" milestone on Avalara](https://developer.avalara.com/products/excise/integration-guides/excise/fch1988984805429/) to see every page in this section.