How to get contact address fields from Zoho Books into Zoho creator form

How to get contact address fields from Zoho Books into Zoho creator form

Hi 

I have created an app which allows users to record a new retainer contract. The main form for this app pulls data from Zoho books using the Zoho integration functions. I can easily populate a dropdown field in my creator form with a list of all company names in Zoho books,  and  when a company is selected I can use this to call an api to collect  a contact Json  I can use to  to populate  first name, last name, email and phone number fields in my creator form. However I cannot get address fields. The only address info I can get from the contact Json is the address id - and I do not know how to use this to return a Json with address details.
Has anyone managed to do this  - any help would be appreciated  as I have spent several hours on this already!!

Thanks in advance

Susan