html 단

    function requestAjax() {
         document.getElementById("checkPhone").hidden=true; // 핸드폰 번호를 입력하였는지 확인
         $.ajax({
         type: "POST",
         dataType: "json",
         async: true,
         timeout: 70000,
         data:({
                phoneInput : document.getElementById("phoneInput").value,
                merchants_id : document.getElementById("merchants_id").value,
                cop_id : document.getElementById("cop_id").value,
                cop_nm : document.getElementById("cop_nm").value,
                goods_nm : document.getElementById("goods_nm").value,
                amount : document.getElementById("amount").value,
                CHC_AUTH_TYPE_CD : document.getElementById("CHC_AUTH_TYPE_CD").value,
                NETCAN_SUBJECT_ID : 0
               }),
         url: "payment_result.php",
         error: function(data){
              requestAjaxError("연결실패1");
         },
         beforeSend: function(){
              requestAjaxWaiting();
         },
         success: function(data){
              requestAjaxResult(data);
         }
         });
    }

action 날라가는 php 단

처리후..

$buyer_phone = $_POST['phoneInput'];

 echo json_encode(array(   
      "resp_cd"=>"6000",
                        "resp_msg"=>"결과응답을 받지 못했습니다. 잠시 후 다시 시도해 주세요.",
                        "ext_tx_number"=>$ext_tx_number,
                        "amount"=>$amount_pay
                      )); 

결제연동 한부분 발췌했음..   색깔부분만 중요하게 보면됨

php + jquery ajax + json