Worked With Cake php and api via zip

I am having trouble working with api in cake php I am using an api via zip to list me the city and state but and save in the bank the bank structure as table city - > name_city, state,
my code is the following sorry for the lack of organization I am still learning to use the stack

controler status:

 public function add($uf = null) {
    if ($uf !== null) {
        $this->loadModel('Estados');
        $estadosSelecionado = $this->Estados->find('list')->where(['nome' => $uf]);
        if ($estadosSelecionado->count() !== 0) {
            // devolver json de estados
            echo json_encode($estadosSelecionado);cal
            exit;
        } else {
            $this->Estados->newEntity();
            $estado = [['nome'] => $uf];
            $estados = $this->Estados->pathEntity($estado);
            $this->Estados->save($estados);
            echo json_encode($estados);
            exit;
        }
    }

ajax:

function consultaCep(cep) {
$.ajax({
    method: "GET",
    url: 'https://viacep.com.br/ws/' + cep + '/json/',
    dataType: "json",
    success: function (ret) {
        console.log(ret);
        console.log(ret.uf);
        $('#endereco').val(ret.logradouro);
        $('#bairro').val(ret.bairro);

        $.ajax({
            method: "GET",
            url: router.url + 'admin/estados/add/' + ret.uf,
            dataType: "json",
            success: function (set) {
                Console.log('Salvo')
            },
            error: function (erro){
                console.log('Não foi possivel salvar')
            }

                /*     var options = [];
                options.push('<option value="">Selecione um Municipio</option>');
                $.each(ret, function (key, val) {
                    options.push('<option value="' + val.id + '">' + val.nome + '</option>');
                })
                $('.lista-municipios').html(options.join(' '));
                $('.lista-municipios').removeAttr('disabled');

* /

        });
    }
    /*var options = [];
     options.push('<option value="">Selecione uma Cidade</option>');
     $.each(ret, function (key, val) {
     options.push('<option value="' + val.id + '">' + val.nome + '</option>');
     })
     $('.lista-municipios').html(options.join(' '));
     $('.lista-municipios').removeAttr('disabled');
     */
});

}

$ (document) .ready (function () {     $ ('. cepGet'). focusout (function {) {         queryCep ($ (this) .val ());         if ($ ('query-municipalities')) val ()! = $ this.val (ret.uf)) {

    }
});

}); / * $ (document) .ready (function () {     if ($ ('query-municipalities'). val ()! = '') {         console.log ($ ('list-municipalities') .prop ('disabled'));         if ($ ('municipal-list'). ('disabled')) {             consult municipalities ($ ('.consult-municipalities').         }     } }); * /