# How long is an access token valid?

Source: https://developer.avalara.com/products/property-tax/integration-guides/avalara-property-tax/pwb3114505402174/

Guide: Avalara Property Tax

# How long is an access token valid?

Token validity depends on the `expires_in` parameter returned when the access token is generated (specified in seconds, for example, 3600). Once the token expires, you must request a new token and avoid caching it beyond that expiration window.