Thingpark integration

Hello! I was trying to add LoRa Adeunis Sensor device using Actility Thingpark, but stopped on Thingpark server field. I don’t understand why Cayenne need to know it. And where can I find information about Thingpark server I am using? I have operator account with custom domain name -
Also why I have to provide user account details? Is Cayenne using Thingpark API? Normally Thingpark is sending uplink payload using http POST, and everything you need to know is route which is configured in Thingpark application server (
For downlink messages I need to provide token to each device. Is it possible to send downlink messages in Cayenne?