WHMCS natively support {YEAR}, {MONTH}, {DAY} and {NUMBER}
Auto-Tags to which
Billing Extension adds {ID}, {USERID}, {COUNTRY}, {CURRENCY} and {VIITENUMERO}.
Starting from
2.2.96 we're going the following auto-tags:
- {A} Random uppercase letter
- {a} Random lowercase letter
- {n} Random number
This allows for the customization of ID numbers assigned to new Invoices, Credit Notes and Proformas as they are issued. For example {YEAR}-{A}{n}{n}{n} will result in numbers like 2019-B547, 2019-H871, 2019-X142 and so on.
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