Zoho Books is online accounting software to manage your accounting, inventory and to file your GST returns. You can manage your contacts, set up rules to categorize banking transactions, make informed decisions based on accurate reports, and keep track of every expense.
To ensure a smooth transition to the latest version, we strongly recommend you to follow these steps:


Authentication
Previous version
The authentication scheme was API key based.
Fetch actions
Fetch actions like Fetch item, Fetch invoice, and Fetch estimate now provide you a dropdown list to select the field you wish to use to search for a record. For example, in the case of Fetch invoice,
Previous version
There were three separate Fetch Invoice actions - Fetch invoice by ID, Fetch invoice by invoice number, and Fetch invoice by CRM Potential ID.
Current version
You can fetch the details of an existing invoice by ID, invoice number or CRM potential ID from the drop-down list in the Fetch invoice action.
Separate Contact modules for Customer and Vendor
Previous version
Create contact, Fetch contact and Update contact.
Current version
You have separate actions for Customer contacts and Vendor contacts.
Customer: Create customer, Fetch customer and Update customer.
Vendor: Create vendor, Fetch vendor and Update vendor.
Fetch salesperson action dropped
Due to technical difficulties, Fetch salesperson action was dropped, and will no longer be available.