in amazon-sns-trigger-server/src/main/java/jetbrains/buildServer/clouds/amazon/sns/trigger/utils/AwsSnsSignatureVerification.java [137:146]
private String stringToSignFromKeys(@NotNull List<String> keysList) {
StringBuilder sb = new StringBuilder();
for (String key : keysList) {
if (myPayload.containsKey(key))
appendWithKeyValuePair(sb, key);
}
return sb.toString();
}