diff --git a/modules/ppcp-blocks/resources/js/Components/paypal.js b/modules/ppcp-blocks/resources/js/Components/paypal.js
index 92287381f..f2185f0b7 100644
--- a/modules/ppcp-blocks/resources/js/Components/paypal.js
+++ b/modules/ppcp-blocks/resources/js/Components/paypal.js
@@ -21,6 +21,7 @@ import {
 	onApproveSavePayment,
 } from '../paypal-config';
 import { useRef } from 'react';
+import Spinner from '../../../../ppcp-button/resources/js/modules/Helper/Spinner';
 
 const PAYPAL_GATEWAY_ID = 'ppcp-gateway';
 
@@ -52,8 +53,11 @@ export const PayPalComponent = ( {
 		useState( false );
 
 	const [ paypalScriptLoaded, setPaypalScriptLoaded ] = useState( false );
+	const [ isFullPageSpinnerActive, setIsFullPageSpinnerActive ] =
+		useState( false );
 
 	const paypalButtonRef = useRef( null );
+	const spinnerRef = useRef( null );
 
 	if ( ! paypalScriptLoaded ) {
 		if ( ! paypalScriptPromise ) {
@@ -70,6 +74,18 @@ export const PayPalComponent = ( {
 		? `${ config.id }-${ fundingSource }`
 		: config.id;
 
+	// Full-page spinner used to block UI interactions during flows like AppSwitch.
+	useEffect( () => {
+		if ( isFullPageSpinnerActive ) {
+			if ( ! spinnerRef.current ) {
+				spinnerRef.current = Spinner.fullPage();
+			}
+			spinnerRef.current.block();
+		} else if ( spinnerRef.current ) {
+			spinnerRef.current.unblock();
+		}
+	}, [ isFullPageSpinnerActive ] );
+
 	useEffect( () => {
 		// fill the form if in continuation (for product or mini-cart buttons)
 		if ( continuationFilled || ! config.scriptData.continuation?.order ) {
@@ -286,6 +302,14 @@ export const PayPalComponent = ( {
 		};
 	}, [ onPaymentSetup, paypalOrder, activePaymentMethod ] );
 
+	useEffect( () => {
+		const unsubscribe = onCheckoutFail( () => {
+			setIsFullPageSpinnerActive( false );
+		} );
+
+		return unsubscribe;
+	}, [ onCheckoutFail ] );
+
 	useEffect( () => {
 		if ( activePaymentMethod !== methodId ) {
 			return;
@@ -336,7 +360,8 @@ export const PayPalComponent = ( {
 						setGotoContinuationOnError,
 						onSubmit,
 						onError,
-						onClose
+						onClose,
+						setIsFullPageSpinnerActive
 					);
 				},
 			}
@@ -491,7 +516,8 @@ export const PayPalComponent = ( {
 					setGotoContinuationOnError,
 					onSubmit,
 					onError,
-					onClose
+					onClose,
+					setIsFullPageSpinnerActive
 				)
 			}
 			onShippingOptionsChange={ getOnShippingOptionsChange(
diff --git a/modules/ppcp-blocks/resources/js/paypal-config.js b/modules/ppcp-blocks/resources/js/paypal-config.js
index 4aacab318..93105786f 100644
--- a/modules/ppcp-blocks/resources/js/paypal-config.js
+++ b/modules/ppcp-blocks/resources/js/paypal-config.js
@@ -64,8 +64,11 @@ export const handleApprove = async (
 	setGotoContinuationOnError,
 	onSubmit,
 	onError,
-	onClose
+	onClose,
+	setIsFullPageSpinnerActive
 ) => {
+	setIsFullPageSpinnerActive( true );
+
 	try {
 		let order;
 
@@ -168,6 +171,8 @@ export const handleApprove = async (
 	} catch ( err ) {
 		console.error( err );
 
+		setIsFullPageSpinnerActive( false );
+
 		onError( err.message );
 
 		onClose();
diff --git a/modules/ppcp-button/resources/js/modules/ContextBootstrap/SingleProductBootstrap.js b/modules/ppcp-button/resources/js/modules/ContextBootstrap/SingleProductBootstrap.js
index ef51b32d5..87dadb468 100644
--- a/modules/ppcp-button/resources/js/modules/ContextBootstrap/SingleProductBootstrap.js
+++ b/modules/ppcp-button/resources/js/modules/ContextBootstrap/SingleProductBootstrap.js
@@ -8,6 +8,7 @@ import SimulateCart from '../Helper/SimulateCart';
 import { strRemoveWord, strAddWord, throttle } from '../Helper/Utils';
 import merge from 'deepmerge';
 import { debounce } from '../../../../../ppcp-blocks/resources/js/Helper/debounce';
+import ResumeFlowHelper from '../Helper/ResumeFlowHelper';
 
 class SingleProductBootstrap {
 	constructor( gateway, renderer, errorHandler ) {
@@ -53,7 +54,10 @@ class SingleProductBootstrap {
 			return;
 		}
 
-		this.render();
+		// Avoid re-rendering during the resume flow to prevent duplicate onApprove callbacks.
+		if ( ! ResumeFlowHelper.isResumeFlow() ) {
+			this.render();
+		}
 
 		this.renderer.enableSmartButtons( this.gateway.button.wrapper );
 		show( this.gateway.button.wrapper );
diff --git a/modules/ppcp-button/resources/js/modules/Helper/Spinner.js b/modules/ppcp-button/resources/js/modules/Helper/Spinner.js
index 30d0830f9..63f941279 100644
--- a/modules/ppcp-button/resources/js/modules/Helper/Spinner.js
+++ b/modules/ppcp-button/resources/js/modules/Helper/Spinner.js
@@ -14,12 +14,16 @@ class Spinner {
 				background: '#fff',
 				opacity: 0.6,
 			},
+			baseZ: 10000,
 		} );
 	}
 
 	unblock() {
 		jQuery( this.target ).unblock();
 	}
-}
 
+	static fullPage() {
+		return new Spinner( window );
+	}
+}
 export default Spinner;
diff --git a/modules/ppcp-button/resources/js/modules/OnApproveHandler/onApproveForContinue.js b/modules/ppcp-button/resources/js/modules/OnApproveHandler/onApproveForContinue.js
index 13b914335..d5c5ab6dc 100644
--- a/modules/ppcp-button/resources/js/modules/OnApproveHandler/onApproveForContinue.js
+++ b/modules/ppcp-button/resources/js/modules/OnApproveHandler/onApproveForContinue.js
@@ -1,3 +1,5 @@
+import Spinner from '../Helper/Spinner';
+
 const initiateRedirect = ( successUrl ) => {
 	/**
 	 * Notice how this step initiates a redirect to a new page using a plain
@@ -15,6 +17,10 @@ const initiateRedirect = ( successUrl ) => {
 
 const onApprove = ( context, errorHandler ) => {
 	return ( data, actions ) => {
+		// Block the entire page during approval process
+		const spinner = Spinner.fullPage();
+		spinner.block();
+
 		const canCreateOrder =
 			! context.config.vaultingEnabled || data.paymentSource !== 'venmo';
 
@@ -50,6 +56,9 @@ const onApprove = ( context, errorHandler ) => {
 
 				const orderReceivedUrl = approveData.data?.order_received_url;
 				initiateRedirect( orderReceivedUrl || context.config.redirect );
+			} )
+			.finally( () => {
+				spinner.unblock();
 			} );
 	};
 };