Let customers create an account (or member) of the online shop.

So that customer can:

• Save cart item.

• Save shipping address.

• Let the customers check their purchase history and status.

Shop owner can:

• Per customers data that allows shop owners to follow up and do marketing more accurately.

• Offer account fund / coupon credit / refund credit

Except for the last bullet, all of these are very very basic functionalities of any eCommerce solution such as WooCommerce and Shopify, etc.