I want to build a very simple workflow:
When a balance is added to my account (business account), I simply want to change a status in a Google Sheets document.
I tried to build it on several different ways but always fails somehow 
I’ve created a sandbox account at Wise and made the (strong) authentication but am not able to make transfers on the sandbox instance.
Tried to setup a webhook but it failed with the error message that the entered webhook url is invalid (tried the test and production one).
So the questions are:
- How do I setup the Wise node OR a webhook correctly to receive calls after a balance is credited in my account
- How can I test it in the sandbox environment
Additionally I do have a strange behavior: If I choose to use the prod-env from Wise, I can’t save my workflow anymore, because of the following error message:
Appreciate for any guidance and help what I do missing to bring this flow live 
n8n-env: self-hosted
Version: 1.109.1