docs: @NonNull
      public static SourceParams createEPSParams(
              @IntRange(from = 0) long amount,
              @NonNull String name,
              @NonNull String returnUrl,
              @Nullable String statementDescriptor) {
          final SourceParams params = new SourceParams()
                  .setType(Source.EPS)
                  .setCurrency(Source.EURO)
                  .setAmount(amount)
                  .setOwner(createSimpleMap(FIELD_NAME, name))
                  .setRedirect(createSimpleMap(FIELD_RETURN_URL, returnUrl));
  
          if (statementDescriptor != null) {
              Map<String, Object> additionalParamsMap =
                      createSimpleMap(FIELD_STATEMENT_DESCRIPTOR, statementDescriptor);
              params.setApiParameterMap(additionalParamsMap);
          }
  
          return params;
      }