Can't create meeting by using an access token(client_credentials) for server-to-server oauth type

API and Webhooks Meetings
15

Here is a complete signature generation code using c# and System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler
hopefully it would help others:


public string GenerateSdkJwtToken(string apiKey, string apiSecret, string meetingNumber, int role)
        { 
            //convert secret to byte[]. This is the correct way.
            var symmetricKey = Encoding.ASCII.GetBytes(apiSecret);
            var tokenHandler = new JwtSecurityTokenHandler();
            //don't automatically add nbf to the generated token.
            tokenHandler.SetDefaultTimesOnTokenCreation = false;
            //set issue date and expiration.
            var now = DateTime.UtcNow;
            //get epoch seconds.
            long tss = ToTimestamp(now.ToUniversalTime()) - 30;
            long expTs = tss + 60 * 60 * 2; //add a reasonable value for expiration time.
            //token payload
            var objTokenDescriptor = new SecurityTokenDescriptor
            {
                Subject = new ClaimsIdentity(new[]
                {   
                    new Claim("sdkKey", sdkKey),
                    new Claim("mn", meetingNumber),
                    new Claim("role", role.ToString()),
                    new Claim("iat", tss.ToString()),
                    new Claim("exp", expTs.ToString()),
                    new Claim("appKey", sdkKey),
                    new Claim("tokenExp", expTs.ToString())
                }),
                //sign the token using Sha256
                SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(symmetricKey),SecurityAlgorithms.HmacSha256Signature)
            };

            var sTokenObj = tokenHandler.CreateToken(objTokenDescriptor );
            var strJwtToken = tokenHandler.WriteToken(sTokenObj);
            //here is your final token.
            return strJwtToken;
        }
//There are several way you can get Epoch seconds. Here is one method 
public static long ToTimestamp(DateTime value)
        {
            TimeSpan t = value - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            long secondsSinceEpoch = (int)t.TotalSeconds;
            return secondsSinceEpoch;
        }
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