# I’m using .NET NugetAvaTaxpackage to connect to AvaTax. Are account ID and license code enough for AvaTaxAPI authentication?

Source: https://developer.avalara.com/avatax-for-vat/qxx1463825564812/

# I’m using .NET NugetAvaTaxpackage to connect to AvaTax. Are account ID and license code enough for AvaTaxAPI authentication?

Learn whether account ID and license code are sufficient for AvaTax API authentication when using the .NET Nuget AvaTax package.

Yes, you can use either username/password or account ID/license for authentication. However, if you're a technology partner, then you must also populate the [X-Avalara-Client http header](https://developer.avalara.com/avatax/client-headers/) with all your calls. You’ll need to set your integration's (app name's) element to this immutable value that identifies your integration.