Do I need to set up Zoho Payments separately in other Zoho Finance applications if I have already configured it in Zoho Books?

No, you don’t need to set it up again. Zoho Payments is a unified payment solution that integrates seamlessly with the Zoho Ecosystem. Once you configure Zoho Payments in any Zoho Finance app such as Zoho Books, Zoho Invoice, Zoho Inventory, Zoho Commerce, Zoho Billing, or Zoho Checkout, it is automatically enabled across the other Zoho Finance applications you use.