> 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.

# Software development kit

Avalara publishes unified SDKs that wrap every product API — calculation, e-invoicing,
returns, ECM, 1099 & W-9, and cross-border — behind a single typed client.

#### [TypeScript / JavaScript](/sdks)

Install from npm and call any Avalara API with full type safety.

#### [Python](/sdks)

Install from PyPI with typed models and auto-pagination.

> **Note**
>
> See the [SDKs](/sdks) product for install steps, auth, and pagination examples.