We have released support for Shopify POS, as well as Shopify POS for orders that do not contain a "billing address".
If paid by Shopify POS, etc., the summary will say "Ordered by: Shopify POS/no billing address".
If you are using Shopify POS and do not have customer data for the billing address, the domestic/overseas setting is automatically determined as "domestic". If you are currently using Shopify POS with a customer outside of Japan, you are not eligible for this service.