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1public static string encryptMessage(String message, String secretKey){
2        Blob key = EncodingUtil.base64Decode(secretKey);
3        Blob data = Blob.valueOf(message);
4        Blob encrypted = Crypto.encryptWithManagedIV('AES128', key, data);
5        return EncodingUtil.base64Encode(encrypted);
6    }
7
8    String secretKey = 'xxxxxxxxxxxxxxxxxxxxxx==';
9    String tokenId = 'xxxxxxxxxxxx';
10    Datetime d = System.now();
11    String payload = 'd='+d.format('yyyyMMddHHmmssSSSZ')+';c='+10+';t='+10;
12    String message = tokenId + ':' + encryptMessage(payload, secretKey);
13
14    HttpRequest req = new HttpRequest();
15    req.setEndpoint('my endpoint url');
16    req.setHeader('Accept', 'application/xml;charset=UTF-8'); 
17    req.setHeader('Authorization', 'OAuth' +     EncodingUtil.base64Encode(blob.valueOf( message)));
18
19Http http = new Http();
20HTTPResponse res = http.send(req);
21string response = res.getBody();