Automate the reception and processing of orders in the online store

Requires the creation of an automated system for receiving and processing electronic orders.

All orders are entered into a single database. Both customer reference modules and the order registration module itself, as well as registries to control the execution of orders, are required.

It would be interesting inexpensive solution without any additional features.
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Quite satisfied with the functionality like this:
express.ipg.ru/func.shtml

I would like some other options.

Thanks in advance to those who respond.