Hello, I'm attempting to update a custom field in Zoho Subscriptions when the status of the ticket is set to a particular status.    I've thought about two ways to do this:

1) Using Zoho Flow

2) Writing a custom function

Here is my difficulty - I need to access the zoho subscription ID or the Subscription number from the zoho subs integration in zoho desk.     Is this possible?   Also, if the contact has more than one subscription, is it possible to build a picklist with their subscriptions populated in it?  

Thanks in advance for any ideas.