What is xFox24? It is an application that automatically sends notifications to your customres about the status of payments for your invoices. Easily add invoices and rules to setup when notifications should be sent. Personalize the notifications. And it's all for free!
Create a free account here. Don't hesitate! Offer limited in time and number of free accounts.
The xFox24 application is verified by Google and also available in Google Marketplace.