post
https://api.intersoftsapient.net/v4/shippingAccounts/rm
Add a shipping account for Royal Mail and either link it with an existing shipping location or add a new shipping location that will be associated with the shipping account.
Note: Before adding a shipping account with Royal Mail, ensure to have the required carrier details, such as the Royal Mail account number, posting location, OBA access code, and receiving hub, so that you can seamlessly use the account for shipping with Royal Mail.
401Unauthorized
403Forbidden
500Internal Server Error
