I'd like to have the possibility to create the invoice for the next billing period, even if it is not yet due. Sometimes customers want to pay earlier or they have products/domains, with due dates just a few days apart.
This is already possible with the "Invoice Selected Items" button.
Relevant documentation: http://docs.whmcs.com/Clients:Summary_Tab#Invoice_Selected_Items
Is this a new option in WHMCS 5.3.14 or has this been here for longer time?
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