Do we have "escrow" service in Auckland for importing international parcels? Perhaps performed by international courier services?

The way I would like it as follows - seller from overseas sends their goods. On receiving the "signature and payment required" parcel I pay the money.

That protects me from paying in advance to unverified seller.

If goods are not requested within period - those are usually either returned back to the sender or destroyed by the courier - following sender's instructions.