diff --git a/README.md b/README.md
index d44f66a..5cca9c0 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,10 @@
 # s3si.ts
+
 Export your battles from SplatNet to stat.ink
+
+## Usage
+
+1. Install deno
+
+2. Run
+   `deno run --allow-net --allow-read --allow-write --allow-env https://raw.githubusercontent.com/spacemeowx2/s3si.ts/master/s3si.ts`
diff --git a/deps.ts b/deps.ts
new file mode 100644
index 0000000..62d8cee
--- /dev/null
+++ b/deps.ts
@@ -0,0 +1,6 @@
+export {
+  Cookie,
+  CookieJar,
+  wrapFetch,
+} from "https://deno.land/x/another_cookiejar@v4.1.4/mod.ts";
+export * as base64 from "https://deno.land/std@0.95.0/encoding/base64.ts";
diff --git a/iksm.ts b/iksm.ts
new file mode 100644
index 0000000..4307caf
--- /dev/null
+++ b/iksm.ts
@@ -0,0 +1,124 @@
+import { CookieJar, wrapFetch } from "./deps.ts";
+import { LoginState } from "./state.ts";
+import { urlBase64Encode } from "./utils.ts";
+
+const NSOAPP_VERSION = "2.3.1";
+
+function random(size: number): ArrayBuffer {
+  return crypto.getRandomValues(new Uint8Array(size)).buffer;
+}
+
+async function getSessionToken({
+  cookieJar,
+  sessionTokenCode,
+  authCodeVerifier,
+}: {
+  cookieJar: CookieJar;
+  sessionTokenCode: string;
+  authCodeVerifier: string;
+}): Promise<string | undefined> {
+  const fetch = wrapFetch({ cookieJar });
+
+  const headers = {
+    "User-Agent": `OnlineLounge/${NSOAPP_VERSION} NASDKAPI Android`,
+    "Accept-Language": "en-US",
+    "Accept": "application/json",
+    "Content-Type": "application/x-www-form-urlencoded",
+    "Content-Length": "540",
+    "Host": "accounts.nintendo.com",
+    "Connection": "Keep-Alive",
+    "Accept-Encoding": "gzip",
+  };
+
+  const body = {
+    "client_id": "71b963c1b7b6d119",
+    "session_token_code": sessionTokenCode,
+    "session_token_code_verifier": authCodeVerifier,
+  };
+
+  const url = "https://accounts.nintendo.com/connect/1.0.0/api/session_token";
+
+  const res = await fetch(url, {
+    method: "POST",
+    headers: headers,
+    body: new URLSearchParams(body),
+  });
+  const resBody = await res.json();
+  return resBody["session_token"];
+}
+
+export async function loginManually(): Promise<LoginState> {
+  const cookieJar = new CookieJar();
+  const fetch = wrapFetch({ cookieJar });
+
+  const state = urlBase64Encode(random(36));
+  const authCodeVerifier = urlBase64Encode(random(32));
+  const authCvHash = await crypto.subtle.digest(
+    "SHA-256",
+    new TextEncoder().encode(authCodeVerifier),
+  );
+  const authCodeChallenge = urlBase64Encode(authCvHash);
+
+  const headers = {
+    "Host": "accounts.nintendo.com",
+    "Connection": "keep-alive",
+    "Cache-Control": "max-age=0",
+    "Upgrade-Insecure-Requests": "1",
+    "User-Agent":
+      "Mozilla/5.0 (Linux; Android 11; Pixel 5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Mobile Safari/537.36",
+    "Accept":
+      "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8n",
+    "DNT": "1",
+    "Accept-Encoding": "gzip,deflate,br",
+  };
+
+  const body = {
+    "state": state,
+    "redirect_uri": "npf71b963c1b7b6d119://auth",
+    "client_id": "71b963c1b7b6d119",
+    "scope": "openid user user.birthday user.mii user.screenName",
+    "response_type": "session_token_code",
+    "session_token_code_challenge": authCodeChallenge,
+    "session_token_code_challenge_method": "S256",
+    "theme": "login_form",
+  };
+  const url = "https://accounts.nintendo.com/connect/1.0.0/authorize?" +
+    new URLSearchParams(body);
+
+  const res = await fetch(
+    url,
+    {
+      method: "GET",
+      headers: headers,
+    },
+  );
+
+  console.log("Navigate to this URL in your browser:");
+  console.log(res.url);
+
+  const login = prompt(
+    'Log in, right click the "Select this account" button, copy the link address, and paste it below:\n',
+  );
+  if (!login) {
+    throw new Error("No login URL provided");
+  }
+  const loginURL = new URL(login);
+  const params = new URLSearchParams(loginURL.hash.substring(1));
+  const sessionTokenCode = params.get("session_token_code");
+  if (!sessionTokenCode) {
+    throw new Error("No session token code provided");
+  }
+
+  const sessionToken = await getSessionToken({
+    cookieJar,
+    sessionTokenCode,
+    authCodeVerifier,
+  });
+  if (!sessionToken) {
+    throw new Error("No session token found");
+  }
+
+  return {
+    sessionToken,
+  };
+}
diff --git a/s3si.ts b/s3si.ts
new file mode 100644
index 0000000..528cd7e
--- /dev/null
+++ b/s3si.ts
@@ -0,0 +1,4 @@
+import { loginManually } from "./iksm.ts";
+
+const state = await loginManually();
+console.log(state);
diff --git a/state.ts b/state.ts
new file mode 100644
index 0000000..94112ab
--- /dev/null
+++ b/state.ts
@@ -0,0 +1,3 @@
+export type LoginState = {
+  sessionToken: string;
+};
diff --git a/utils.ts b/utils.ts
new file mode 100644
index 0000000..53545cb
--- /dev/null
+++ b/utils.ts
@@ -0,0 +1,16 @@
+import { base64 } from "./deps.ts";
+
+export function urlBase64Encode(data: ArrayBuffer) {
+  return base64.encode(data)
+    .replaceAll("+", "_")
+    .replaceAll("/", "-")
+    .replaceAll("=", "");
+}
+
+export function urlBase64Decode(data: string) {
+  return base64.decode(
+    data
+      .replaceAll("_", "+")
+      .replaceAll("-", "/"),
+  );
+}