code: public Contact viewContact(final String id) throws NotFoundException, GeneralException, UnauthorizedException {
          if (id == null) {
              throw new IllegalArgumentException("Contact ID must be specified.");
          }
          return messageBirdService.requestByID(CONTACTPATH, id, Contact.class);
      }
docs: Retrieves the information of an existing contact. You only need to supply
  the unique contact ID that was returned upon creation or receiving.