I had the same problem and solve as following: // set config Dictionary<string,string> config = new Dictionary<string,string>(); config.Add("mode", "live"); config.Add("clientId", "xxx"); config.Add("clientSecret", "xxx"); var accessToken = new OAuthTokenCredential(config).GetAccessToken(); // get the GetAccessToken with the config var apiContext = new APIContext(accessToken); apiContext.Config = config; // no need in "sandbox" mode, but need in "live" mode hope it helps
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