diff --git a/android/src/main/java/com/boltreactnativesdk/GooglePayModule.kt b/android/src/main/java/com/boltreactnativesdk/GooglePayModule.kt
index ba24291..2fb80b1 100644
--- a/android/src/main/java/com/boltreactnativesdk/GooglePayModule.kt
+++ b/android/src/main/java/com/boltreactnativesdk/GooglePayModule.kt
@@ -1,6 +1,8 @@
 package com.boltreactnativesdk
 
 import android.app.Activity
+import android.content.Intent
+import com.facebook.react.bridge.ActivityEventListener
 import com.facebook.react.bridge.Promise
 import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.bridge.ReactContextBaseJavaModule
@@ -27,7 +29,12 @@ import java.net.URL
  * and passed down in the config JSON.
  */
 class GooglePayModule(reactContext: ReactApplicationContext) :
-    ReactContextBaseJavaModule(reactContext) {
+    ReactContextBaseJavaModule(reactContext),
+    ActivityEventListener {
+
+    init {
+        reactContext.addActivityEventListener(this)
+    }
 
     companion object {
         const val NAME = "BoltGooglePay"
@@ -36,26 +43,32 @@ class GooglePayModule(reactContext: ReactApplicationContext) :
 
     override fun getName(): String = NAME
 
-    private var paymentsClient: PaymentsClient? = null
     private var pendingPromise: Promise? = null
     private var pendingPublishableKey: String = ""
     private var pendingBaseUrl: String = ""
 
-    private fun getPaymentsClient(): PaymentsClient {
-        if (paymentsClient == null) {
-            val walletOptions = Wallet.WalletOptions.Builder()
-                .setEnvironment(WalletConstants.ENVIRONMENT_TEST)
-                .build()
-            paymentsClient = Wallet.getPaymentsClient(reactApplicationContext, walletOptions)
-        }
-        return paymentsClient!!
+    private fun getPaymentsClient(activity: Activity): PaymentsClient {
+        val walletOptions = Wallet.WalletOptions.Builder()
+            .setEnvironment(WalletConstants.ENVIRONMENT_TEST)
+            .build()
+        return Wallet.getPaymentsClient(activity, walletOptions)
+    }
+
+    override fun invalidate() {
+        reactApplicationContext.removeActivityEventListener(this)
+        super.invalidate()
     }
 
     @ReactMethod
     fun isReadyToPay(configJson: String, promise: Promise) {
+        val activity = reactApplicationContext.currentActivity
+        if (activity == null) {
+            promise.resolve(false)
+            return
+        }
         try {
             val isReadyToPayRequest = IsReadyToPayRequest.fromJson(buildIsReadyToPayRequest().toString())
-            getPaymentsClient().isReadyToPay(isReadyToPayRequest)
+            getPaymentsClient(activity).isReadyToPay(isReadyToPayRequest)
                 .addOnCompleteListener { task ->
                     promise.resolve(task.isSuccessful && task.result == true)
                 }
@@ -77,12 +90,15 @@ class GooglePayModule(reactContext: ReactApplicationContext) :
 
             val activity = reactApplicationContext.currentActivity
             if (activity == null) {
+                pendingPromise = null
+                pendingPublishableKey = ""
+                pendingBaseUrl = ""
                 promise.reject("NO_ACTIVITY", "No current activity")
                 return
             }
 
             AutoResolveHelper.resolveTask(
-                getPaymentsClient().loadPaymentData(request),
+                getPaymentsClient(activity).loadPaymentData(request),
                 activity,
                 LOAD_PAYMENT_DATA_REQUEST_CODE
             )
@@ -91,11 +107,20 @@ class GooglePayModule(reactContext: ReactApplicationContext) :
         }
     }
 
+    // ActivityEventListener — receives onActivityResult forwarded by React Native
+    override fun onActivityResult(activity: Activity, requestCode: Int, resultCode: Int, data: Intent?) {
+        if (requestCode == LOAD_PAYMENT_DATA_REQUEST_CODE) {
+            val paymentData = data?.let { PaymentData.getFromIntent(it) }
+            handlePaymentResult(resultCode, paymentData)
+        }
+    }
+
+    override fun onNewIntent(intent: Intent) {}
+
     /**
-     * Called from the Activity's onActivityResult.
      * Processes the Google Pay payment data and tokenizes via Bolt.
      */
-    fun handlePaymentResult(resultCode: Int, paymentData: PaymentData?) {
+    private fun handlePaymentResult(resultCode: Int, paymentData: PaymentData?) {
         val promise = pendingPromise ?: return
         pendingPromise = null
 
diff --git a/src/__tests__/CreditCard.test.tsx b/src/__tests__/CreditCard.test.tsx
index fef39d7..caad11c 100644
--- a/src/__tests__/CreditCard.test.tsx
+++ b/src/__tests__/CreditCard.test.tsx
@@ -73,6 +73,11 @@ describe('Bolt', () => {
     bolt.configureOnPageStyles(newStyles);
     expect(bolt.getOnPageStyles()).toEqual(newStyles);
   });
+
+  it('should return X-Publishable-Key header from apiHeaders()', () => {
+    const bolt = new Bolt({ publishableKey: 'pk_test_abc' });
+    expect(bolt.apiHeaders()).toEqual({ 'X-Publishable-Key': 'pk_test_abc' });
+  });
 });
 
 describe('CreditCard', () => {
diff --git a/src/client/Bolt.ts b/src/client/Bolt.ts
index e998ea2..414417e 100644
--- a/src/client/Bolt.ts
+++ b/src/client/Bolt.ts
@@ -52,4 +52,14 @@ export class Bolt {
   getOnPageStyles(): Styles | undefined {
     return this.onPageStyles;
   }
+
+  /**
+   * Returns the standard HTTP headers required for Bolt REST API calls.
+   * Centralised here so every API caller uses a consistent header name.
+   */
+  apiHeaders(): Record<string, string> {
+    return {
+      'X-Publishable-Key': this.publishableKey,
+    };
+  }
 }
diff --git a/src/payments/GoogleWallet.tsx b/src/payments/GoogleWallet.tsx
index bc6ed1b..c03f825 100644
--- a/src/payments/GoogleWallet.tsx
+++ b/src/payments/GoogleWallet.tsx
@@ -37,15 +37,13 @@ export interface GoogleWalletProps {
  * The config includes tokenization spec, merchant ID, and merchant name
  * so the developer doesn't need to provide them.
  */
-const fetchGooglePayAPMConfig = async (
+export const fetchGooglePayAPMConfig = async (
   apiUrl: string,
-  publishableKey: string
+  headers: Record<string, string>
 ): Promise<GooglePayAPMConfigResponse> => {
   const response = await fetch(`${apiUrl}/v1/apm_config/googlepay`, {
     method: 'GET',
-    headers: {
-      merchant_token: publishableKey,
-    },
+    headers,
   });
 
   if (!response.ok) {
@@ -82,7 +80,7 @@ export const GoogleWallet = ({
   useEffect(() => {
     if (Platform.OS !== 'android') return;
 
-    fetchGooglePayAPMConfig(bolt.apiUrl, bolt.publishableKey)
+    fetchGooglePayAPMConfig(bolt.apiUrl, bolt.apiHeaders())
       .then(setApmConfigResponse)
       .catch((err) => {
         onError?.(
@@ -91,7 +89,7 @@ export const GoogleWallet = ({
             : new Error('Failed to fetch Google Pay config')
         );
       });
-  }, [bolt.apiUrl, bolt.publishableKey, onError]);
+  }, [bolt, onError]);
 
   // Check Google Pay readiness once we have the APM config
   useEffect(() => {