Floating IP Move API python client issue

Hello,

We have purchased 1 floating IP(/32) from,
https://www.soyoustart.com/en/ip-failover.xml
And want to achieve automatic failover using API
https://eu.api.soyoustart.com/console/#/ip/%7Bip%7D/move#POST

We have created all the required keys and secret properly and fill them in python api calling script and execute this script we receive the error,
'vh.exceptions.InvalidKey: This application key is invalid'
The complete script response shared in below link
https://pastebin.com/4C6hJ3qY

When try to contact OVH support guys, they are saying they wont be able to help and need to raise issue here in community.
Can anybody please point out what am I missing or doing wrong? thanks.