diff --git a/package.json b/package.json
index 50cdde1..9300a37 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@authsignal/browser",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",
diff --git a/src/passkey.ts b/src/passkey.ts
index 3e925af..506ac54 100644
--- a/src/passkey.ts
+++ b/src/passkey.ts
@@ -21,6 +21,13 @@ type SignUpResponse = {
   token?: string;
 };
 
+type SignInParams = {
+  token?: string;
+  autofill?: boolean;
+  action?: string;
+  onVerificationStarted?: () => unknown;
+};
+
 type SignInResponse = {
   token?: string;
   userId?: string;
@@ -81,13 +88,7 @@ export class Passkey {
     };
   }
 
-  async signIn(): Promise<SignInResponse | undefined>;
-  async signIn(params?: {action: string; autofill?: boolean}): Promise<SignInResponse | undefined>;
-  async signIn(params?: {token: string}): Promise<SignInResponse | undefined>;
-  async signIn(params?: {autofill: boolean}): Promise<SignInResponse | undefined>;
-  async signIn(
-    params?: {token?: string; autofill?: boolean; action?: string} | undefined
-  ): Promise<SignInResponse | undefined> {
+  async signIn(params?: SignInParams): Promise<SignInResponse | undefined> {
     if (params?.token && params.autofill) {
       throw new Error("autofill is not supported when providing a token");
     }
@@ -115,6 +116,10 @@ export class Passkey {
 
     const authenticationResponse = await startAuthentication(optionsResponse.options, params?.autofill);
 
+    if (params?.onVerificationStarted) {
+      params.onVerificationStarted();
+    }
+
     const verifyResponse = await this.api.verify({
       challengeId: optionsResponse.challengeId,
       authenticationCredential: authenticationResponse,