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- ST Web Invoice is an online invoice and estimate software with ajax enhanced interface. It supports the US Dollar, Canadian Dollar, Australian Dollar, and the British Pound. It supports PayPal, Authorize.net, and 2Checkout. All details of the system can be customized from invoice templates, to site colors, to customized lookup items, and more! Email your clients their invoices in html, PDF, or both. Your clients can login to view all invoices and pay them online. There are great reporting tools to keep you informed. There is much much more! Install on your own server or let us host it for FREE!