Integrated Carrier Query (Shopify - UPS Integration) "Negotiated Rates"?

[Landau]

Hello,

A couple months before launching our Shopify website I connected our Shopify store to UPS via the courier settings in Shopify admin. It works but I am confused about where the "negotiated rates" are actually pulled from. We only use UPS for international orders (of which there are few), but the ones we get don't send any data to UPS?

Can anyone explain how this works, please?

Many thanks,

Michael