code: public Member register(RegistrationRequest registrationRequest) throws RegistrationException {
          Member member = getMember(registrationRequest.getEnrollmentID());
  	    member.register(registrationRequest);
  	    return member;
      }
docs: Register a user or other member type with the chain.
  @param registrationRequest Registration information.
  @throws RegistrationException if the registration fails
  @return