code: @NonNull
      public static SourceParams createMultibancoParams(
              @IntRange(from = 0) long amount,
              @NonNull String returnUrl,
              @NonNull String email) {
          return new SourceParams()
                  .setType(Source.MULTIBANCO)
                  .setCurrency(Source.EURO)
                  .setAmount(amount)
                  .setRedirect(createSimpleMap(FIELD_RETURN_URL, returnUrl))
                  .setOwner(createSimpleMap(FIELD_EMAIL, email));
      }
docs: Create parameters necessary to create a Multibanco source.
  
  @param amount A positive integer in the smallest currency unit representing the amount to
  charge the customer (e.g., 1099 for a €10.99 payment).
  @param returnUrl The URL the customer should be redirected to after the authorization
  process.
  @param email The full email address of the customer.
  @return a {@link SourceParams} object that can be used to create a Multibanco source
  
  @see <a href="https://stripe.com/docs/sources/multibanco">https://stripe.com/docs/sources/multibanco</a>