The AvaTax release schedule includes a preview period during which time the latest software is available for integration testing in the AvaTax Sandbox Environment two weeks before launching to production. If your engineering team would like a sandbox account for integration testing purposes:

Development and Solutions Partners (DSP), please contact your Business Development Manager.
Avalara customers, please contact your Customer Account Manager or open a support ticket.

Added ServiceType mapping for AvataxESB.
Added ServiceType mapping for ContentGenerationPOS.
Added a validation to ensure StartDate is always prior to end Date for Reports.
Fixed a bug in which Product Classification System API was missing an entry for NIgeria.
Added a support for filtering ErrorTransactions by expiresAt.

ENVIRONMENT	URL	RELEASE DATE
Sandbox	https://sandbox-rest.avatax.com	2021-03-11
Production	https://rest.avatax.com	2021-03-18