diff --git a/src/access_tokens.ts b/src/access_tokens.ts
index ca21e9b..90898de 100644
--- a/src/access_tokens.ts
+++ b/src/access_tokens.ts
@@ -1,5 +1,7 @@
 import dayjs, { Dayjs } from "dayjs";
 import { v4 as uuid } from "uuid";
+import crypto from "crypto";
+
 import { Encryption } from "./encryption";
 import logger from "./logger";
 
@@ -94,3 +96,25 @@ export class AccessTokenPerAuthToken implements AccessTokens {
 
   authTokenFor = (value: string): string | undefined => this.accessTokenToAuthToken.get(value);
 }
+
+export const sha256 = (salt: string) => (authToken: string) => crypto
+  .createHash("sha256")
+  .update(`${authToken}${salt}`)
+  .digest("hex")
+
+export class InMemoryAccessTokens implements AccessTokens {
+  tokens = new Map<string, string>();
+  minter;
+
+  constructor(minter: (authToken: string) => string) {
+    this.minter = minter
+  }
+
+  mint = (authToken: string): string => {
+    const accessToken = this.minter(authToken);
+    this.tokens.set(accessToken, authToken);
+    return accessToken;
+  }
+
+  authTokenFor = (value: string): string | undefined => this.tokens.get(value);
+}
diff --git a/src/app.ts b/src/app.ts
index e21ffbf..d9dde3d 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -3,6 +3,8 @@ import server from "./server";
 import logger from "./logger";
 import { Navidrome } from "./navidrome";
 import encryption from "./encryption";
+import { InMemoryAccessTokens, sha256 } from "./access_tokens";
+import { InMemoryLinkCodes } from "./link_codes";
 
 const PORT = +(process.env["BONOB_PORT"] || 4534);
 const WEB_ADDRESS =
@@ -18,6 +20,7 @@ const bonob = bonobService(
   WEB_ADDRESS,
   "AppLink"
 );
+const secret = process.env["BONOB_SECRET"] || "bonob";
 
 const sonosSystem = sonos(SONOS_DEVICE_DISCOVERY, SONOS_SEED_HOST);
 if(process.env["BONOB_SONOS_AUTO_REGISTER"] == "true") {
@@ -34,8 +37,10 @@ const app = server(
   WEB_ADDRESS,
   new Navidrome(
     process.env["BONOB_NAVIDROME_URL"] || "http://localhost:4533",
-    encryption(process.env["BONOB_SECRET"] || "bonob")
-  )
+    encryption(secret)
+  ),
+  new InMemoryLinkCodes(),
+  new InMemoryAccessTokens(sha256(secret))
 );
 
 app.listen(PORT, () => {
diff --git a/tests/access_tokens.test.ts b/tests/access_tokens.test.ts
index 331b208..478d368 100644
--- a/tests/access_tokens.test.ts
+++ b/tests/access_tokens.test.ts
@@ -5,6 +5,8 @@ import {
   AccessTokenPerAuthToken,
   EncryptedAccessTokens,
   ExpiringAccessTokens,
+  InMemoryAccessTokens,
+  sha256
 } from "../src/access_tokens";
 import { Encryption } from "../src/encryption";
 
@@ -207,5 +209,65 @@ describe("AccessTokenPerAuthToken", () => {
       expect(accessTokens.authTokenFor(uuid())).toBeUndefined();
     });
   });
-
+});
+
+describe('sha256 minter', () => {
+  it('should return the same value for the same salt and authToken', () => {
+    const authToken = uuid();
+    const token1 = sha256("salty")(authToken);
+    const token2 = sha256("salty")(authToken);
+
+    expect(token1).not.toEqual(authToken);
+    expect(token1).toEqual(token2);
+  });
+
+  it('should returrn different values for the same salt but different authTokens', () => {
+    const authToken1 = uuid();
+    const authToken2 = uuid();
+
+    const token1 = sha256("salty")(authToken1);
+    const token2= sha256("salty")(authToken2);
+
+    expect(token1).not.toEqual(token2);
+  });
+
+  it('should return different values for the same authToken but different salts', () => {
+    const authToken = uuid();
+
+    const token1 = sha256("salt1")(authToken);
+    const token2= sha256("salt2")(authToken);
+
+    expect(token1).not.toEqual(token2);
+  });
+});
+
+describe("InMemoryAccessTokens", () => {
+  const reverseAuthToken = (authToken: string) => authToken.split("").reverse().join("");
+
+  const accessTokens = new InMemoryAccessTokens(reverseAuthToken);
+
+  it("should return the same access token for the same auth token", () => {
+    const authToken = "token1";
+    
+    const accessToken1 = accessTokens.mint(authToken);
+    const accessToken2 = accessTokens.mint(authToken);
+
+    expect(accessToken1).not.toEqual(authToken);
+    expect(accessToken1).toEqual(accessToken2);
+  });
+
+  describe("when there is an auth token for the access token", () => {
+    it("should be able to retrieve it", () => {
+      const authToken = uuid();
+      const accessToken = accessTokens.mint(authToken);
+
+      expect(accessTokens.authTokenFor(accessToken)).toEqual(authToken);
+    });
+  });
+
+  describe("when there is no auth token for the access token", () => {
+    it("should return undefined", () => {
+      expect(accessTokens.authTokenFor(uuid())).toBeUndefined();
+    });
+  });
 });