Japan domestic shipping is a separate purchase cost
A product may be inexpensive but located far from the proxy warehouse or sold with buyer-paid delivery. Record whether the seller includes domestic shipping, whether a marketplace campaign changes it, and whether several orders come from the same seller. This cost exists before international shipping begins.
Seller-to-warehouse shipping can vary inside one marketplace
One Mercari seller may include shipping while another does not; a Rakuten merchant may set a threshold; an auction seller may specify a method only after the win. Capture the actual source terms instead of assigning one domestic-shipping rule to an entire marketplace.
Domestic shipping also affects timing
The warehouse cannot inspect, consolidate or quote the international parcel until the Japan-side shipment arrives. For time-sensitive orders, the seller’s dispatch estimate can matter as much as the domestic fee.
What the interface should make explicit
For domestic shipping in orders, the service should show which facts come from the Japanese source, which amounts are estimates, which stage is waiting on a seller or warehouse, and what action the buyer can still change. On Japan Domestic Shipping in Proxy Orders, that separation tells the buyer whether the unresolved issue is source evidence, money, timing or the physical shipment, instead of hiding all four behind one generic status.
Example: two Mercari listings with different domestic terms
Listing A costs ¥10,000 with seller-paid delivery; Listing B costs ¥9,500 plus ¥900 Japan domestic shipping. Before proxy fees or US freight, Listing A is already ¥400 cheaper on the Japan-side transaction. A unified search should preserve that distinction instead of sorting only by item price.
Domestic shipping also creates a parcel handoff
The seller’s tracking or dispatch notice should lead to a warehouse receipt record. If the package is delayed or returned inside Japan, that issue belongs to the domestic leg and should not be displayed as an international-carrier delay.