ChainStoreWeb.TokenHelper.CreateAcsClientContextForUrl C# (CSharp) Method

        private static ClientContext CreateAcsClientContextForUrl(SPRemoteEventProperties properties, Uri sharepointUrl)
        {
            string contextTokenString = properties.ContextToken;

            if (String.IsNullOrEmpty(contextTokenString))
            {
                return null;
            }

            SharePointContextToken contextToken = ReadAndValidateContextToken(contextTokenString, OperationContext.Current.IncomingMessageHeaders.To.Host);
            string accessToken = GetAccessToken(contextToken, sharepointUrl.Authority).AccessToken;

            return GetClientContextWithAccessToken(sharepointUrl.ToString(), accessToken);
        }