Norchex Bank

Hi

 I Hope someone can helps me

I have sold an item to someone in the US and he apparently has paid by Norchex online banking. They state i am to send the item and then send them Norchex bank the tracking number and only then will they realease the money.

I have always been told not to send until ican see the payment in my acc, We are at a stand still , Buyer wants his item , i want my money before i send item and Bank wants tracking number before it will release money.

What should i do.

Glenfoyle1965