Authorize.Net is launching it's new proprietary Invoicing service during September and October of 2017.
Brand new merchants obtaining gateways through GatewayOnly will have full access to the Invoicing solution almost immediately.
New merchants can locate the Invoicing option under the Tools tab within their Authorize.Net Merchant Interface home page.
Existing merchants will have accessing to Invoicing as the service is rolled out during September and October.
The Invoicing service is completely FREE.