Hi,
1. When pushing addresses to HikaShop, you can directly add them in hikashop_address. It's the simplest.
2. To push the data the other way when the customer modify the address in HikaShop or create a new one or delete one, you can develop a small plugin of the group "hikashop" and implement the "after" triggers of the address API in it:
www.hikashop.com/support/documentation/6...ntation.html#address
3. If you look at the hikashop_address table, you can see the address_default column which enables you to select the main address of the customer which will be used as default address for the billing and the shipping. There is no system for now to have different default addresses for shipping and billing.