You can use a Custom Invoice ID for your invoices. To assign a custom ID to your agency account, go to Settings > Invoices, Offer and Payments > Invoices. You'll have the option to start with a new number or continue a existing one. 

Once you create an invoice, you can click Edit and add a custom invoice ID.

If you have Payment Plans enabled, you can add the ID in the invoice preview.

Custom IDs will reflect on the invoice tab, contracts and invoices.

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