code: private void invokeInstanceRegistrationRequest(final Context context) {
  
          AuthorizationRequestManager.RequestOptions options = new AuthorizationRequestManager.RequestOptions();
  
          options.parameters = createRegistrationParams();
          options.headers = createRegistrationHeaders();
          options.requestMethod = Request.POST;
  
          InnerAuthorizationResponseListener listener = new InnerAuthorizationResponseListener() {
              @Override
              public void handleAuthorizationSuccessResponse(Response response) throws Exception {
                  saveCertificateFromResponse(response);
                  invokeAuthorizationRequest(context);
              }
          };
  
          authorizationRequestSend(null, "clients/instance", options, listener);
      }
docs: Invoke request for registration, the result of the request should contain ClientId.
  @param context android context