code: @NonNull
      public static SourceParams createVisaCheckoutParams(@NonNull String callId) {
          return new SourceParams()
                  .setType(Source.CARD)
                  .setApiParameterMap(
                          createSimpleMap(VISA_CHECKOUT, createSimpleMap(CALL_ID, callId)));
      }
docs: Create parameters needed to make a Visa Checkout source.
  
  @param callId The payment request ID (callId) from the Visa Checkout SDK.
  @return a {@link SourceParams} object that can be used to create a Visa Checkout Card Source.
  
  @see <a href="https://stripe.com/docs/visa-checkout">https://stripe.com/docs/visa-checkout</a>
  @see <a href="https://developer.visa.com/capabilities/visa_checkout/docs">https://developer.visa.com/capabilities/visa_checkout/docs</a>