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// Assume List<MerchantVa> result already contains the data
List<Map<String, String>> simplifiedData = result.stream()
    .map(merchantVa -> {
        Map<String, String> vaPrefixMap = new HashMap<>();
        vaPrefixMap.put("va", merchantVa.getVa());
        vaPrefixMap.put("prefix", merchantVa.getPrefix());
        return vaPrefixMap;
    })
    .collect(Collectors.toList());

// Now you can iterate over the simplified data
for (Map<String, String> item : simplifiedData) {
    System.out.println("VA: " + item.get("va") + ", Prefix: " + item.get("prefix"));
}