## Zoho Billing - Product, solutions, integrations, support, and resources Index Access the complete documentation index at: https://www.zoho.com/om/billing/llms.txt Use this file to discover all available documentation pages before proceeding. [Back](./) # How do I identify an advance invoice? Currently, you can identify the type of invoice only in API using the Retrieve an Invoice API. In the API response, check the is\_advance\_invoice field: * If is\_advance\_invoice is true, the invoice is an advance invoice. * If is\_advance\_invoice is false, it is a normally renewed invoice.