This integration works with the CyberChef server published here: https://github.com/gchq/CyberChef-server or you can also use the https://prod.apifor.io service. 

If you decide to use api for service (https://prod.apifor.io) you need to register:
https://prod.apifor.io/account/register?email=youremailhere

Then follow the instructions to get your api key.