The easiest way to share the invoice with your client is through the Customer Portal. 

1. Set up a rule with an email that includes a link to customer Portal. Please see this article for the further information. 

2. Clients will find the paid invoice from their Customer Portal, under Invoices. Invoice can be downloaded as PDF from here. 

3. Be sure that the invoice is shown in Customer Portal in your Frontoffice Settings.

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