0Browser automatically generates an API token key for your account when you sign up.
You can view and copy this token into your code in order to authenticate the requests made to 0Browser.
To find your token navigate to your Account page.
Navigate down to API Key section and click on "View API Key" button to be able to view and copy your token.
In case you need to invalidate the current token and generate a new one, you can simply re-generate the account token by navigating to the same section as above and then clicking on "Re-Generate API Key" as shown in the screen shot below.
Now you can use the account token to pass into the request made to 0Browser endpoint.