diff --git a/iamport.ts b/iamport.ts
new file mode 100644
index 0000000..0fbccc4
--- /dev/null
+++ b/iamport.ts
@@ -0,0 +1,40 @@
+
+export interface ExtendedIamportWindow extends Window {
+  IMP: IMP
+}
+
+export interface IMP {
+  init: ( imp_uid: string ) => void;
+  request_pay: ( params: IamportPaymentRequest, callback: ( res: IamportPaymentResponse ) => void ) => void;
+}
+
+export type IamportPaymentResponse = {
+  success: true,
+  imp_uid: string,
+  merchant_uid: string,
+  pay_method: string,
+  status: string,
+  name: string,
+  card_name: string,
+  card_quota: number,
+  buyer_name: string,
+  buyer_email: string,
+  paid_amount: number,
+  paid_at: string
+  receipt_url: string,
+} | {
+  success: false,
+  error_code: string
+  error_msg: string,
+}
+
+export type IamportPaymentRequest = {
+  pg: string,
+  pay_method: "card" | "vbank",
+  merchant_uid: string,
+  name: string,
+  amount: number,
+  buyer_email: string,
+  buyer_name: string,
+  notice_url?: string,
+}