Can I keep each customer in Shop at their established rate?

Yes, for this you have to set a tariff for each customer.

You must create the tariff from Settings > Basic Settings > Price Rates > +New

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Once you have created the tariff you must indicate the price, you can do this by accessing the products tab > Tariffs tab, click on the tariff and indicate the corresponding price. You can also do it through a mass update, click here to know how to do it.

Once you have configured the rates of the products, you must enter the customers' tab > Commercial tab and in the Rate field indicate the corresponding one.

You can do it in bulk by means of a file update, click here to know how is the process to be performed.

Finally you must go to Features > My STEL Shop > Click Users Tab, in the Fee field for guests, indicate Customer Prices.