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String token = getAuthToken(receivedHttpHeaders);
String[] chunks = token.split("\\.");
Base64.Decoder decoder = Base64.getUrlDecoder();
String header = new String(decoder.decode(chunks[0]));
String payload = new String(decoder.decode(chunks[1]));
JsonObject jsonObject = new JsonObject();
jsonObject.add("payload", JsonParser.parseString(payload));
String serviceId = jsonObject.getAsJsonObject("payload").get("serviceId").getAsString(); //if the json token has the field serviceId