NHN KCP payment window integration guide

1. Configure NHH KCP PG settings

Refer to the NHN KCP settings page to configure the PG settings.

2. Request payment

To open the payment window, call JavaScript SDK IMP.request_pay(param, callback).

In PC browsers, callback is invoked after calling IMP.request_pay(param, callback). In mobile browsers, the page is redirected to m_redirect_url.

Javascript SDK
IMP.request_pay( { pg: "kcp", pay_method: "card", merchant_uid: "{Merchant created Order ID}", // Example: order_no_0001 name: "Order name: Test payment request", amount: 14000, buyer_email: "", buyer_name: "John Doe", buyer_tel: "010-1234-5678", buyer_addr: "Shinsa-dong, Gangnam-gu, Seoul", buyer_postcode: "123-456", language: "ko", // default: ko (Korean) m_redirect_url: "{Mobile only - URL to redirect to after payment approval}", // Example: }, function (rsp) { // callback logic //* ...Omitted... *// }, );

Key parameter description

pg * string

PG code

  • If not specified and this is the only PG setting that exists, default PG is automatically set.
  • If there are multiple PG settings, set to kcp.

pay_method * string

Payment method code

Payment method codes

  • card (credit card)
  • trans(instant account transfer)
  • vbank(virtual account)
  • phone(mobile micropayment)
  • samsung(Samsung Pay)
  • kakaopay(Kakao Pay)
  • payco ( PAYCO hub-type)
  • lpay (LPAY hub-type)
  • naverpay (Naver Pay)
  • cultureland(Cultureland)
  • smartculture(Smart Culture)
  • happymoney(Happy Money)
  • booknlife(Book culture gift certificate)
  • point(Benepia)

merchant_uid * string

Order ID

Must be unique for each request.

amount * integer

Payment amount

Must be an integer (not string).

For Payco hub-type, you must apply through KCP Admin page and configure the settings.

How to apply:

3. Additional functions

{ "display": { "card_quota": [6] // Display up to 6 months installment plans } }


  • card_quota :
    • []: Only immediate pay
    • 2,3,4,5,6: immediate, 2, 3, 4, 5, 6 month installment plans\

Installment plan option is available only for KRW 50,000 or more.

Example of allowing up to 3 months installment plans

4. Additional parameters

To use the gift certificate payment method, set the merchant assigned user ID as follows:

javascript SDK
{ "bypass": { "shop_user_id": "ABCD123" // Merchant user ID (20 bytes) } }

This parameter is required for gift certificate providersโ€™ RM action.

Example of paying with Cultureland gift certificate

  pg: "kcp.{Site code for gift certificate use}",
  pay_method: "cultureland", //Gift certificate
  merchant_uid: "A00021-TEST",
  name: "Carrots 10kg",
  amount: 1004,
  buyer_email: "",
  buyer_name: "iamport tech support",
  buyer_tel: "010-1234-5678",
  buyer_addr: "Shinsa-dong, Gangnam-gu, Seoul",
  buyer_postcode: "123-456",
  bypass: {
    shop_user_id: "abaddd", // Merchant user ID