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https://api.dialogportal.com/v1/user

If we Let us assume that the the following details:

The application’s AppKey is 3276832767, and that it initiates the request on the 8th of February 2013 April 2014 at 0704:1859:00 51 UTC, so the raw token is:

32768POSThttps  32767POSThttps://api.dialogportal.com/v1/user20130208071800user20140408045941

The following C# method will return the encrypted token, using the AppSecret as the encryption key:

public static string EncryptToken(string secret, string token) { 
	byte[] bytesSecret = Encoding.UTF8.GetBytes(secret); 
	using (var hmacsha256 = new HMACSHA256(bytesSecret)) { 
		byte[] tokenBytes = Encoding.UTF8.GetBytes(token); 
		return Convert.ToBase64String(hmacsha256.ComputeHash(tokenBytes)); 
	}
}

When encrypted using AppSecret RCL1EDAYOVHANLL3A51G, the encrypted token is:

S/3bH3CD44NVM15UpuYds3iJEUp+xicCUZigXpghzaQ=

The complete signature will then look like this:

Signature: { 
	"AppKey": 3276832767, 
	"IssuedAt": "2013020807180020140408045941", 
	"Token": "wytqCR4v1jmZxo22CeC0Qlp9sGi/MJ47G/Yitjg2X8US/3bH3CD44NVM15UpuYds3iJEUp+xicCUZigXpghzaQ="
}