> 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: Communications

This first task describes authenticating in AvaTax for Communications using the API, including the available authentication methods. It also provides helpful information about AvaTax for Communication's 2 environments: [Sandbox](https://communicationsua.avalara.net/) and [Production](https://communications.avalara.net/).

> **Note**
>
> Part of the **Communications integration** integration guide. [Open the full "Build" milestone on Avalara](https://developer.avalara.com/products/communications/integration-guides/communications-integration/tis3223535618368/) to see every page in this section.