code: @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));
      }
docs: Create parameters needed to make a Masterpass source
  
  @param transactionId The transaction ID from the Masterpass SDK.
  @param cartID A unique string that you generate to identify the purchase when creating a cart
  for checkout in the Masterpass SDK.
  
  @return a {@link SourceParams} object that can be used to create a Masterpass Card Source.
  
  @see <a href="https://stripe.com/docs/masterpass">https://stripe.com/docs/masterpass</a>
  @see <a href="https://developer.mastercard.com/product/masterpass">https://developer.mastercard.com/product/masterpass</a>
  @see <a href="https://developer.mastercard.com/page/masterpass-merchant-mobile-checkout-sdk-for-android-v2">https://developer.mastercard.com/page/masterpass-merchant-mobile-checkout-sdk-for-android-v2</a>