How to Automatically Generate Invoice Numbers in OpenCart 2.x

OpenCart enables you, as a store admin, to generate order invoices with just a few clicks. However, order invoice numbers are not automatically added to the invoice, but they have to be pre-generated, which is rather cumbersome. In this tutorial we will demonstrate how you can automate this process. Keep on reading if you would like to know how you can save time by adding a simple modification, which will automatically generate invoice number at the moment of order placing.
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