Braintree.TestUtil.TestHelper.GenerateInvalidUsBankAccountNonce C# (CSharp) Метод

        public static string GenerateInvalidUsBankAccountNonce()
        {
            var valid_characters = "bcdfghjkmnpqrstvwxyz23456789";
            var token = "tokenusbankacct";
            Random rnd = new Random();
            for(int i=0; i<4; i++) {
                token += "_";
                for(int j=0; j<6; j++) {
                    token += valid_characters[rnd.Next(0,valid_characters.ToCharArray().Length)];
                }
            }
            return token + "_xxx";
        }