From Bring website:

__In order to get access to test customer numbers, users in Norway can contact integrasjon.norge@bring.com. Users in Sweden, Denmark and Finland can contact edi@bring.com. State which test customer number you want access to, and that you need financial rights as well. Financial rights are required to get pricing information when using Shipping Guide API. The services covered by each test customer number can be found in the Service portfolio.

Parcel Norway domestic
Customer: PARCELS_NORWAY-00000000005
Use 5 as the customer number in the request. Example: "customerNumber": "5"
Parcel Sweden, Denmark, Finland & Parcel Norway cross-border
Customer: PARCELS_SWEDEN-000006
Use 6 as the customer number in the request. Example: "customerNumber": "6"
Cargo Norway domestic
Customer: CARGO-851028
Use 7 as the customer number in the request. Example: "customerNumber": "7"__