Avalara Keys are needed to run Avalara Services in BigBusiness for live lookup of Tax.
Generating keys replaces existing keys which deactives them. Please use carefully.
Go to your Avalara account, to AvaTax Sandbox or Production, and go Settings menu, License and API Keys, and Generate New Key. Copy or Download and keep safely.
Also, copy your Account ID to put into Avalara Settings in BigBusiness to connect.