You can create invoice, quotations using this very easy. And also you can manage your product or service list easily. Once you create the invoice or quotation you view them in PDF button and by clicking the button you can email the invoice and equation to your client instantly. PayPal express checkout has been integrated with this script. Payment tracking and receipt generation also implemented These are the features : Create invoice easily by selecting predefined item list Ability to edit the invoice Invoices can be viewed as PDF or HTML format You can email the invoice to client in HTML formal by clicking one button PayPal express checkout has been integrated Payment can be done as installments for a given Invoice and payment can be viewed separately Receipt generates for a payment in PDF format And more...