Custom dynamic data to generate a ticket's invoice

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You can store Next Invoice Number and Expiration Date as Global Settings.

This tutorial may give an idea about how to maintain external counters.

How to create the PERFECT BILL

This tutorial can also give an idea about how to create date constraints.

Age Check for selling drinks

In this tutorial I’ll show you how to implement a Age Check mechanism that is required to sell alcoholic drinks in some countries. Important Install at least 4.1.61 version before implementing this tutorial. For simplicity I’ll skip Rule Mapping Steps. While creating a rule don’t forget to add rule map. ###Preparing Products and Tickets I’ll start by configuring a custom product tag named Confirm Age. [image] After Saving it edit your products and set Confirm Age tag to True …

Authorization Number can also be a Global Setting but if it does not change you can hardcode it in printer template.

As you’ve stated you can query and store these values on tickets as ticket tags. Having a ticket state that updates on invoice print can also help not to increase invoice number on multiple prints.