docs: @NonNull
      public static SourceParams createMasterpassParams(
              @NonNull String transactionId,
              @NonNull String cartID) {
          final Map<String, Object> map = createSimpleMap(TRANSACTION_ID, transactionId);
          map.put(CART_ID, cartID);
  
          return new SourceParams()
                  .setType(Source.CARD)
                  .setApiParameterMap(createSimpleMap(MASTERPASS, map));
      }