Ability to Add Multiple KPN/RoutIT Partner Cards

From KPN/RoutIT, we have multiple partner cards. This is very common to separate matters within KPN and can arise, for example, through acquisitions. In Salesbuildr, only one can be linked, which means not all KPN contracts are visible at the customer level.

An API is available for each partner card from RoutIT. By being able to link multiple APIs via Grexx, we can retrieve all relevant information.