How to look up WHMCS invoices by their old number
In WHMCS, you can configure paid invoices to be “auto numbered” when they’re paid. This changes the invoice number they have in WHMCS. For example, your invoice #20 gets paid, and it’s the fifth invoice you mark as paid. It’s now marked as Paid#5 (if this happens to you – start using that “Send reminder” […]
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