diff --git a/index.html b/index.html
index f518d15..9595a13 100644
--- a/index.html
+++ b/index.html
@@ -36,7 +36,7 @@
             const clientProvider = new DynamicRegistrationClientProvider
             const cachingClientProvider = new CachingClientProvider(clientProvider)
 
-            const dPoPTokenProvider = new DPoPTokenProvider(callbackUri, ui.getCode.bind(ui), cachingASProvider, cachingClientProvider)
+            const dPoPTokenProvider = new DPoPTokenProvider(callbackUri, ui, cachingASProvider, cachingClientProvider)
 
             const fetch = new ReactiveFetchManager([dPoPTokenProvider]).fetch
 
diff --git a/src/AuthorizationCodeFlow.ts b/src/AuthorizationCodeFlow.ts
index 36adfce..d6b88c2 100644
--- a/src/AuthorizationCodeFlow.ts
+++ b/src/AuthorizationCodeFlow.ts
@@ -1,5 +1,6 @@
 import { Mutex } from "./Mutex.js"
 import { CodeRequestCancelledError } from "./CodeRequestCancelledError.js"
+import type { CodeProvider } from "./CodeProvider.js"
 
 const authorizationWindowName = "oidcAuthentication"
 const onlyOnce = {once: true}
@@ -119,7 +120,7 @@ const html = `
  * </style>
  * ```
  */
-export class AuthorizationCodeFlow extends HTMLElement {
+export class AuthorizationCodeFlow extends HTMLElement implements CodeProvider {
     readonly #mutex = new Mutex
     #newModal!: HTMLDialogElement
     #switchModal!: HTMLDialogElement
@@ -194,7 +195,6 @@ export class AuthorizationCodeFlow extends HTMLElement {
             this.ownerDocument.defaultView?.removeEventListener("message", onMessage)
             signal.removeEventListener("abort", onAbort)
             this.#switchModal.close()
-            this.#authorizationWindow?.close()
             respondWithCode(message.data)
         }
 
@@ -218,6 +218,10 @@ export class AuthorizationCodeFlow extends HTMLElement {
         return await responseFromPopup
     }
 
+    cleanup(): void {
+        this.#authorizationWindow?.close()
+    }
+
     #onSubmit(e: SubmitEvent) {
         e.preventDefault()
 
diff --git a/src/BearerTokenProvider.ts b/src/BearerTokenProvider.ts
index 051af48..52a5259 100644
--- a/src/BearerTokenProvider.ts
+++ b/src/BearerTokenProvider.ts
@@ -1,15 +1,15 @@
 import * as oauth from "oauth4webapi"
-import { GetCodeCallback } from "./GetCodeCallback.js"
+import { CodeProvider } from "./CodeProvider.js"
 import { TokenProvider } from "./TokenProvider.js"
 
 // TODO: Configure properly for insecure localhost only
 const oauthAllowInsecureRequests = true
 
 export class BearerTokenProvider implements TokenProvider {
-    readonly #getCode: GetCodeCallback
+    readonly #codeProvider: CodeProvider
 
-    constructor(getCodeCallback: GetCodeCallback) {
-        this.#getCode = getCodeCallback
+    constructor(codeProvider: CodeProvider) {
+        this.#codeProvider = codeProvider
     }
 
     async #getIssuer(request: Request): Promise<URL> {
@@ -75,7 +75,7 @@ export class BearerTokenProvider implements TokenProvider {
         //     authorizationUrl.searchParams.set("nonce", nonce)
         // }
 
-        const authorizationCodeResponse = await this.#getCode(authorizationUrl, request.signal)
+        const authorizationCodeResponse = await this.#codeProvider.getCode(authorizationUrl, request.signal)
         const authorizationCodeParams = oauth.validateAuthResponse(authorizationServer, clientRegistration, new URL(authorizationCodeResponse))
 
         let clientAuth = oauth.None()
diff --git a/src/CodeProvider.ts b/src/CodeProvider.ts
new file mode 100644
index 0000000..aac64eb
--- /dev/null
+++ b/src/CodeProvider.ts
@@ -0,0 +1,5 @@
+export interface CodeProvider {
+    getCode(authorizationUri: URL, signal: AbortSignal): Promise<string>
+
+    cleanup(): void
+}
diff --git a/src/DPoPTokenProvider.ts b/src/DPoPTokenProvider.ts
index 17e0123..b953ea9 100644
--- a/src/DPoPTokenProvider.ts
+++ b/src/DPoPTokenProvider.ts
@@ -1,6 +1,6 @@
 import * as oauth from "oauth4webapi"
 import * as DPoP from "dpop"
-import type { GetCodeCallback } from "./GetCodeCallback.js"
+import type { CodeProvider } from "./CodeProvider.js"
 import type { TokenProvider } from "./TokenProvider.js"
 import type { AuthorizationServerProvider } from "./AuthorizationServerProvider.js"
 import { ClientProvider } from "./ClientProvider.js"
@@ -8,14 +8,14 @@ import { ClientProvider } from "./ClientProvider.js"
 type CacheEntry = { created: number, tokenResult: oauth.TokenEndpointResponse, dpopKey: CryptoKeyPair }
 
 export class DPoPTokenProvider implements TokenProvider {
-    readonly #getCode: GetCodeCallback
+    readonly #codeProvider: CodeProvider
     readonly #callbackUri: string
     readonly #cache = new Map<string, CacheEntry> // TODO: Take cache from caller
     readonly #asProvider: AuthorizationServerProvider
     readonly #clientProvider: ClientProvider
 
-    constructor(callbackUri: string, getCodeCallback: GetCodeCallback, asProvider: AuthorizationServerProvider, clientProvider: ClientProvider) {
-        this.#getCode = getCodeCallback
+    constructor(callbackUri: string, codeProvider: CodeProvider, asProvider: AuthorizationServerProvider, clientProvider: ClientProvider) {
+        this.#codeProvider = codeProvider
         this.#callbackUri = callbackUri
         this.#asProvider = asProvider
         this.#clientProvider = clientProvider
@@ -73,7 +73,7 @@ export class DPoPTokenProvider implements TokenProvider {
             }
         }
 
-        const authorizationCodeResponse = await this.#getCode(authorizationUrl, request.signal)
+        const authorizationCodeResponse = await this.#codeProvider.getCode(authorizationUrl, request.signal)
 
         let authorizationCodeParams
         try {
@@ -89,13 +89,14 @@ export class DPoPTokenProvider implements TokenProvider {
                 console.debug("Authorization server requires user interaction, retrying without prompt")
 
                 authorizationUrl.searchParams.delete("prompt")
-                const authorizationCodeResponse = await this.#getCode(authorizationUrl, request.signal)
+                const authorizationCodeResponse = await this.#codeProvider.getCode(authorizationUrl, request.signal)
                 authorizationCodeParams = oauth.validateAuthResponse(authorizationServer, clientRegistration, new URL(authorizationCodeResponse), state)
             } else {
                 throw e
             }
         }
 
+        this.#codeProvider.cleanup()
         const tokenResponse = await oauth.authorizationCodeGrantRequest(authorizationServer, clientRegistration, this.getClientAuth(authorizationServer.issuer, clientRegistration), authorizationCodeParams, this.#callbackUri, authorizationServer.code_challenge_methods_supported !== undefined ? codeVerifier : oauth.nopkce, {DPoP: dpop, signal: request.signal})
 
         const tokenResult = await oauth.processAuthorizationCodeResponse(authorizationServer, clientRegistration, tokenResponse, {expectedNonce: this.nonceVerificationOverride(authorizationServer.issuer, nonce)})
diff --git a/src/GetCodeCallback.ts b/src/GetCodeCallback.ts
deleted file mode 100644
index 6d0e672..0000000
--- a/src/GetCodeCallback.ts
+++ /dev/null
@@ -1 +0,0 @@
-export type GetCodeCallback = (authorizationUri: URL, signal: AbortSignal) => Promise<string>
\ No newline at end of file
diff --git a/src/ReactiveFetchWorkerManager.ts b/src/ReactiveFetchWorkerManager.ts
index ce8b41c..186f039 100644
--- a/src/ReactiveFetchWorkerManager.ts
+++ b/src/ReactiveFetchWorkerManager.ts
@@ -1,10 +1,10 @@
-import type { GetCodeCallback } from "./GetCodeCallback.js"
+import type { CodeProvider } from "./CodeProvider.js"
 
 export class ReactiveFetchWorkerManager {
-    readonly #getCode: GetCodeCallback
+    readonly #codeProvider: CodeProvider
 
-    constructor(getCodeCallback: GetCodeCallback) {
-        this.#getCode = getCodeCallback
+    constructor(codeProvider: CodeProvider) {
+        this.#codeProvider = codeProvider
     }
 
     async register() {
@@ -15,6 +15,6 @@ export class ReactiveFetchWorkerManager {
     }
 
     async #onMessage(e: MessageEvent<string>) {
-        e.ports[0]?.postMessage(await this.#getCode(new URL(e.data), null!)) // TODO: Signal?
+        e.ports[0]?.postMessage(await this.#codeProvider.getCode(new URL(e.data), null!)) // TODO: Signal?
     }
 }
diff --git a/src/mod.ts b/src/mod.ts
index 7fed984..5441d6c 100644
--- a/src/mod.ts
+++ b/src/mod.ts
@@ -6,7 +6,7 @@ export * from "./ReactiveFetchWorkerManager.js"
 export * from "./CodeRequestCancelledError.js"
 export * from "./ReactiveAuthenticationError.js"
 export * from "./ClientCredentialsTokenProvider.js"
-export * from "./GetCodeCallback.js"
+export * from "./CodeProvider.js"
 export * from "./PatternIssuerProvider.js"
 export * from "./TokenProvider.js"
 export * from "./IssuerProvider.js"
diff --git a/src/reactive-fetch-worker.ts b/src/reactive-fetch-worker.ts
index 2e9a310..a1e9904 100644
--- a/src/reactive-fetch-worker.ts
+++ b/src/reactive-fetch-worker.ts
@@ -28,8 +28,8 @@ async function onFetch(e: FetchEvent): Promise<void> {
 }
 
 function upgrade(request: Request, client: Client): Promise<Response> {
-    const dPoPTokenProvider = new DPoPTokenProvider(undefined!, postEventAndWait.bind(undefined, client), undefined!, undefined!) // TODO: Callback, getIssuer, getClient
-    const bearerProvider = new BearerTokenProvider(postEventAndWait.bind(undefined, client))
+    const dPoPTokenProvider = new DPoPTokenProvider(undefined!, undefined!, undefined!, undefined!) // TODO: Callback, getIssuer, getClient
+    const bearerProvider = new BearerTokenProvider(undefined!)
 
     return new ReactiveAuthenticationClient(self.fetch, [bearerProvider, dPoPTokenProvider]).fetch(request)
 }