Can I set a random number increment?

With this Custom Order Number module you will be able to choose any counter increment step, so that your competitors won’t be able to detect sales made in your store.

This can be done in System > Configuration > Custom Order Number > Order > Counter Increment Step:

Magento Custom Order Number extension by Amasty


Increment steps can also be customized for invoices, shipping and credit memos.

See more details on Custom Order Number page
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