Yeah, I have a credential I created with the API v1 key. However I cannot use that credential in the new HL node. That method has been depreciated it seems. I’ll keep monitoring your conversation with Mariana to see if she’s able to find a resolve from her side HighLevel Custom Fields not working.
Also, how did you get it to work using the HTTP request node? Also, it seems even that method won’t solve the ‘Custom Field’ malfunction 