The Smart Invoice iPhone application allows you to remotely use Smart Invoice to:
• Create new clients, projects, and tasks on the fly
• Track time by client, project and task
• Create and categorize expenses
• Create invoices
• Receive credit card payments for invoices you create on your iPhone (currently works with Authorize.net)—this functionality essentially turns your iPhone into a mobile credit card processor.
This application requires a Smart Invoice account (you can create one for free at www.SmartInvoice.com), and utilizes the Smart Invoice API to securely transmit data.