The MERGE function under Invoices is a bit flimsy as you can only merge invoices for one customer at a time and only for one billing cycle. Customers (some) pay them separately and don't bother to add them together so they make multiple payments instead of just ONE. Result: I pay more in transaction fees to the cc processors and we look kind of stupid to the clients!
I think it would be very useful if the customer could pay all invoices during one billing cycle at once. The Admin meanwhile should have the option of keeping the invoices separated if need be.
Here is a recent example of what I've run across. A customer who has 2 invoices for two different hosting services coming due ON THE SAME DAY cannot receive a merged invoice from me unless I physically go into WHMCS and merge the two. This should be automatic! It is not very friendly for the Admin to have to go to potentially hundreds of sites to perform a simple merge of a few invoices.
Will this be addressed?