diff --git a/pages/api/icns-verification.ts b/pages/api/icns-verification.ts
new file mode 100644
index 0000000..904ff5c
--- /dev/null
+++ b/pages/api/icns-verification.ts
@@ -0,0 +1,32 @@
+import { withIronSessionApiRoute } from "iron-session/next";
+import type { NextApiRequest, NextApiResponse } from "next";
+import { ironOptions } from "../../iron.config";
+import { IcnsVerificationInfoResponse } from "../../types/api-response";
+import { request } from "../../utils/url";
+
+export default withIronSessionApiRoute(async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse,
+) {
+  try {
+    if (!process.env.ICNS_VERIFIER_URI) {
+      console.log(".env is not set");
+      return res.status(500).json({ error: "Internal server error" });
+    }
+    const icnsVerificationInfo = await request<IcnsVerificationInfoResponse>(
+      process.env.ICNS_VERIFIER_URI,
+      {
+        method: "post",
+        headers: {
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify(req.body),
+      },
+    );
+    res.status(200).json(icnsVerificationInfo);
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ error: "Internal server error" });
+  }
+},
+ironOptions);
diff --git a/pages/api/twitter-auth-info.ts b/pages/api/twitter-auth-info.ts
index ff0300e..ca75901 100644
--- a/pages/api/twitter-auth-info.ts
+++ b/pages/api/twitter-auth-info.ts
@@ -13,29 +13,39 @@ export default withIronSessionApiRoute(async function handler(
     !process.env.TWITTER_CLIENT_SECRET ||
     !process.env.TWITTER_AUTH_CALLBACK_URI
   ) {
-    return res
-      .status(500)
-      .send(
+    console.error(new Error(".env is not set"));
+    return res.status(500).send({
+      error:
         "Twitter app client id or client secret or callback URI is not set",
-      );
+    });
   }
 
   if (!req.session.code_verifier) {
-    return res.status(401).send("No OAuth2.0 code verifier");
+    return res.status(401).send({
+      error: "No OAuth2.0 code verifier",
+    });
   }
 
   try {
-    const { code, state } = req.query;
-    if (state !== process.env.TWITTER_AUTH_STATE) {
-      return res.status(401).send("State isn't matching");
+    const params = new URLSearchParams();
+
+    if (req.session.refresh_token) {
+      params.append("grant_type", "refresh_token");
+      params.append("refresh_token", req.session.refresh_token);
+      params.append("client_id", process.env.TWITTER_CLIENT_ID);
+    } else {
+      const { code, state } = req.query;
+      if (state !== process.env.TWITTER_AUTH_STATE) {
+        return res.status(401).send({ error: "State isn't matching" });
+      }
+
+      params.append("grant_type", "authorization_code");
+      params.append("code", code as string);
+      params.append("redirect_uri", process.env.TWITTER_AUTH_CALLBACK_URI);
+      params.append("code_verifier", req.session.code_verifier);
     }
 
-    const params = new URLSearchParams();
-    params.append("grant_type", "authorization_code");
-    params.append("code", code as string);
-    params.append("redirect_uri", process.env.TWITTER_AUTH_CALLBACK_URI);
-    params.append("code_verifier", req.session.code_verifier);
-    const { access_token: accessToken } =
+    const { access_token: accessToken, refresh_token } =
       await request<TwitterOAuth2TokenResponse>(
         `${twitterApiBaseUrl}/oauth2/token`,
         {
@@ -49,6 +59,9 @@ export default withIronSessionApiRoute(async function handler(
           body: params,
         },
       );
+
+    req.session.refresh_token = refresh_token;
+    await req.session.save();
     const {
       data: { id, username },
     } = await request<TwitterUsersMeResponse>(`${twitterApiBaseUrl}/users/me`, {
@@ -62,8 +75,8 @@ export default withIronSessionApiRoute(async function handler(
       username,
     });
   } catch (error) {
-    console.log(error);
-    res.status(500).send("Internal server error ");
+    console.error(error);
+    res.status(500).json({ error: "Internal server error " });
   }
 },
 ironOptions);
diff --git a/pages/api/twitter-auth-url.ts b/pages/api/twitter-auth-url.ts
index 556185e..5d82b7e 100644
--- a/pages/api/twitter-auth-url.ts
+++ b/pages/api/twitter-auth-url.ts
@@ -14,10 +14,12 @@ export default withIronSessionApiRoute(async function handler(
   res: NextApiResponse,
 ) {
   if (
-    !process.env.TWITTER_AUTH_STATE ||
-    !process.env.TWITTER_AUTH_CODE_CHALLENGE
+    !process.env.TWITTER_CLIENT_ID ||
+    !process.env.TWITTER_AUTH_CALLBACK_URI ||
+    !process.env.TWITTER_AUTH_STATE
   ) {
-    return res.status(500).send("No state or code_challenge");
+    console.error(new Error(".env is not set"));
+    return res.status(500).json({ error: "Internal server error" });
   }
 
   try {
@@ -42,7 +44,7 @@ export default withIronSessionApiRoute(async function handler(
     res.status(200).json({ authUrl });
   } catch (error) {
     console.error(error);
-    res.status(500).send("Internal server error");
+    res.status(500).json({ error: "Internal server error" });
   }
 },
 ironOptions);
@@ -50,5 +52,6 @@ ironOptions);
 declare module "iron-session" {
   interface IronSessionData {
     code_verifier?: string;
+    refresh_token?: string;
   }
 }
diff --git a/pages/verification/index.tsx b/pages/verification/index.tsx
index 113a477..cdd3068 100644
--- a/pages/verification/index.tsx
+++ b/pages/verification/index.tsx
@@ -1,25 +1,51 @@
 import { useEffect, useState } from "react";
-import { TwitterAuthInfoResponse } from "../../types/api-response";
+import {
+  IcnsVerificationInfoResponse,
+  TwitterAuthInfoResponse,
+} from "../../types/api-response";
+import { VerifierMsg } from "../../types/msg";
+import { request } from "../../utils/url";
 
 export default function VerificationPage() {
   const [twitterAuthInfo, setTwitterAuthInfo] =
     useState<TwitterAuthInfoResponse | null>();
 
-  const fetchAccessToken = async (state: string, code: string) => {
-    const newTwitterAuthInfo: TwitterAuthInfoResponse = await (
-      await fetch(`/api/twitter-auth-info?state=${state}&code=${code}`)
-    ).json();
-
-    setTwitterAuthInfo(newTwitterAuthInfo);
-  };
-
   useEffect(() => {
-    const [, state, code] =
-      window.location.search.match(
-        /^(?=.*state=([^&]+)|)(?=.*code=([^&]+)|).+$/,
-      ) || [];
+    const handleVerification = async () => {
+      const [, state, code] =
+        window.location.search.match(
+          /^(?=.*state=([^&]+)|)(?=.*code=([^&]+)|).+$/,
+        ) || [];
+      const newTwitterAuthInfo = await request<TwitterAuthInfoResponse>(
+        `/api/twitter-auth-info?state=${state}&code=${code}`,
+      );
 
-    fetchAccessToken(state, code);
+      console.log(newTwitterAuthInfo);
+
+      setTwitterAuthInfo(newTwitterAuthInfo);
+      const verifierMsg: VerifierMsg = {
+        name: newTwitterAuthInfo.username,
+        claimer: "osmo1y5mm5nj5m8ttddt5ccspek6xgyyavehrkak7gq",
+        contract_address: "osmo1y5mm5nj5m8ttddt5ccspek6xgyyavehrkak7gq",
+        chain_id: "osmosis-1",
+      };
+      const icnsVerificationInfo = await request<IcnsVerificationInfoResponse>(
+        "/api/icns-verification",
+        {
+          method: "post",
+          headers: {
+            "Content-Type": "application/json",
+          },
+          body: JSON.stringify({
+            msg: JSON.stringify(verifierMsg),
+            authToken: newTwitterAuthInfo.accessToken,
+          }),
+        },
+      );
+      console.log(icnsVerificationInfo);
+    };
+
+    handleVerification();
   }, []);
 
   return (
diff --git a/types/api-response.ts b/types/api-response.ts
index 5062d89..d0b4bd1 100644
--- a/types/api-response.ts
+++ b/types/api-response.ts
@@ -7,3 +7,8 @@ export interface TwitterAuthInfoResponse {
   id: string;
   username: string;
 }
+
+export interface IcnsVerificationInfoResponse {
+  signature: number[];
+  algorithm: string;
+}
diff --git a/types/msg.ts b/types/msg.ts
new file mode 100644
index 0000000..ff58829
--- /dev/null
+++ b/types/msg.ts
@@ -0,0 +1,6 @@
+export interface VerifierMsg {
+  name: string;
+  claimer: string;
+  contract_address: string;
+  chain_id: string;
+}