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Compute signature of a http from Hoiio. This is used to authenticate the notification from Hoiio. Match this computed signature with the HTTP header "X-Hoiio-Signature".
public String computeHoiioSignature(byte[] payload, String accessToken) {
MessageDigest md = MessageDigest.getInstance("SHA-256");
byte[] bytes = md.digest();
String mySign = Hex.encodeHexString(bytes);
return mySign;
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