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Allow your customers to create an account to track their orders. You may also issue points to their account and allow them to redeem the points for gifts or other items. You may also use their account to hold small amount of money so they can use it on their next purchase.
Learn more about miyoc.ID and Members System here.
You may want to charge additional shipping cost for overseas orders. This tool will allows you to preset the amount to charge for different countries.
You will be able to support more than 1 currency in your store. Your customers may choose their preferred currency and the prices will be converted according to the conversion rate you set up. During checkout, the final price will be converted to your default currency. This will ensure that you will not be messed up when handling the orders.