Think about walking into a bank, a hotel, or even your favourite store. The first place you head to isn't the manager's office.

View paid, unpaid, and overdue invoices.
Review and approve quotes
Check the account statement and outstanding balances.
Download transaction history.
Make online payment, including bulk payment (when the gateway is configured).
All without needing to contact your business every time.

Important Action
Before enabling Customer Portal for your clients, spend time customizing what they will have access to
Go to Settings -> Customer Portal
You can do the following.
Add a banner message to welcome clients
Enable activity notification for portal actions
Notify customers when you comment on a transaction
Allow customers to edit contact details
Allow customers to forward documents
Enable customer reviews from the portal
Allow access to the project and timesheet (if applicable)

Things to Remember
Customer Portal is a secure workspace where customers can manage their interactions with your business. When customer receives the portal invoice, they gain access to:
Their invoices, quotes and payment history
Account statement and outstanding
Project details and timesheets
Online payment options
Comments and updates related to the transaction.
Offering an additional security layer is crucial and the Customer Portal also supports Multi-Factor Authentication (MFA). Enabling MFA helps protect customer accounts by requiring an additional verification step during sign-in, giving both you and your customers greater confidence that sensitive financial information remains secure.

Pro Tip:
The Customer Portal becomes even more valuable when paired with Zoho SalesIQ.
By integrating SalesIQ, customers can quickly ask questions and raise concerns while they are viewing invoices, quotes, or account details. Instead of switching to email or phone calls, they receive assistance in context, which helps resolve queries faster and build strong, long-term customer relationships.

Watch Out:
Each portal user must have a unique email address. The same email address cannot be associated with multiple customer portal account.
Before enabling portal access, verify the contact's email address to ensure the invitation reaches the correct recipients and avoid conflicts during activation.