Add delete invoice comand to the WHMCS api
This will be very very useful as its very very compliacted to delete an invoice based on the order number.
Currently the way I do this, is use GetOrders for the client and loop through the orders using the invoice number which then gives me the order number after which I can use CancelOrder by passing the order number. Would be nice to simply be able to pass the invoice id to the api and delete the invoice though.
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