code: public static void initialise(@NonNull Application app, @NonNull ComapiConfig config, Callback<ComapiClient> callback) {
  
          String error = checkIfCanInitialise(app, config, false);
          if (!TextUtils.isEmpty(error) && callback != null) {
              callback.error(new Exception(error));
          }
  
          ComapiClient client = new ComapiClient(config);
          CallbackAdapter adapter = config.getCallbackAdapter() != null ? config.getCallbackAdapter() : new CallbackAdapter();
          client.initialise(app, adapter, callback);
      }
docs: Build SDK client. Can be called only once in onCreate callback on Application class.