Invoicing About App Quickly create and send invoices to anyone. Get paid, on average, 15 days quicker by enabling our online and in-app payment acceptance powered by Stripe. Install App See all Apps How to Activate Invoicing Follow these easy steps to Install and activate the invoicing app. Fisrt off, click on the Start Icon and select "App store" From the app store click the install button on the invoicing card at the lower right