An API token is an alphanumeric code, unique to your Xignite account, which can be used from any system to validate your API calls. API tokens are passed in the username field of any SOAP code. For REST, the URL can be appended with "&_token=CLIENTTOKEN".

For example, an API Token can be used in a multi-server configuration without following up to add each IP address to your account. If load balancing switches the call to originate/execute from another server, this is seamless when using an API Token. This allows for a more dynamic and error-free configuration. 

To add an API Token to your account, follow these steps:
Go to My Account --> API -->API Tokens: https://www.xignite.com/MyAccount/#/api/tokens
Click blue 'Add a new token' button and it will randomly generate a token for your account.