What are the QuickBooks Addins?

Elate QuickBooks invoicing software can generate a QuickBooks online invoice template that complies with FTA regulations and meets your demands.
You can develop personalized QuickBooks templates and automatically print invoices by regional regulations and QuickBooks rules with the aid of Elate QB Addins.

Source: https://www.elatesoft.com/blog/elate-quickbooks-addins/