Zoho Flow - Forms to Marketing Automation

Zoho Flow - Forms to Marketing Automation

I'm trying to push a completed Zoho Form entry (embedded in my website) to the marketing automation module. I want to create a new lead and then add the lead to a journey,

Can anyone tell me what 'journey key' I need to complete this automation in zoho flow? Cannot find it documented anywhere and have searched through the marketing automation module with no success. Is this an API key or something else?