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

# Ecommerce

> API solutions for end-to-end tax compliance.

## Docs

- [Before you begin](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/before-you-begin.md)
- [Authentication](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/authentication.md)
- [Error handling](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/error-handling.md)
- [Configure AvaTax](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/configure-avatax.md)
- [AvaTax transction concepts](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/avatax-transction-concepts.md)
- [Design the user experience](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/design-the-user-experience.md)
- [Design the transaction workflow](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/design-the-transaction-workflow.md)
- [Test transactions](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/test-transactions.md)
- [Calculate tax offline](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/calculate-tax-offline.md)
- [Functional review](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/functional-review.md)
- [Revision history](https://avalara.ferndocs.com/docs/integration-guides/sales-and-use-tax/ecommerce/revision-history.md)