There are two ways of how you can start sending e-invoices.
1) To send an e-invoice to the other company within PayTraq, you can use PayTraq Direct. In this case both you and your customer should be using PayTraq.
PayTraq Direct option should be activated for the customer.
2) To send an e-invoice to the other company outside PayTraq, you can use the integration with one of e-Invoice operators. In this case your customer can be using any other accounting program.
E-Invoice option should be activated for the customer.
E-invoice can be send either by clicking on the "Send e-Invoice" link
or by enabling Send e-Invoice checkbox while sending the invoice by e-mail
You can also export your invoice in one of the e-invoice format. This can be done from the invoice online link.