> 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/communications-tax/comms-rest-v2/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://avalara.ferndocs.com/_mcp/server.

# Communications REST v2 Developer Guide

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

## Docs

- [Account Creation](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/account-creation.md)
- [Authentication](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/authentication.md)
- [Environments and Endpoints](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/environments-and-endpoints.md)
- [Demo Application](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/demo-application.md)
- [Best Practices](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/best-practices.md)
- [Required Fields](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/required-fields.md)
- [Commit Request](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/commit-request.md)
- [Client Profiles](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/client-profiles.md)
- [Account Customizations](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/account-customizations.md)
- [Transaction Use Cases](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/transaction-use-cases.md)
- [Jurisdiction Determination Use Cases](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/jurisdiction-determination-use-cases.md)
- [Calculate Taxes](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/calculate-taxes.md)
- [Commit](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/commit.md)
- [Jurisdiction Determination](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/jurisdiction-determination.md)
- [Lookups](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/lookups.md)
- [Customization](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/customization.md)
- [Errors](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/errors.md)
- [Detecting a Dropped Connection](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/detecting-a-dropped-connection.md)
- [Retry or Fallback](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/retry-or-fallback.md)
- [Data Recovery Using Commit/Uncommit](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/data-recovery-using-commit-uncommit.md)
- [Reconcile Your Transactions](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/reconcile-your-transactions.md)
- [Geocode Offline](https://avalara.ferndocs.com/docs/integration-guides/communications-tax/comms-rest-v2/geocode-offline.md)