diff --git a/client/my-sites/checkout/src/lib/existing-card-processor.ts b/client/my-sites/checkout/src/lib/existing-card-processor.ts
index 152ef746d51cd..2478d33676da1 100644
--- a/client/my-sites/checkout/src/lib/existing-card-processor.ts
+++ b/client/my-sites/checkout/src/lib/existing-card-processor.ts
@@ -119,13 +119,14 @@ export default async function existingCardProcessor(
 			}
 			return stripeResponse;
 		} )
-		.then( ( stripeResponse ) => {
-			if ( stripeResponse?.redirect_url && ! doesTransactionResponseRequire3DS( stripeResponse ) ) {
-				debug( 'transaction requires redirect' );
-				return makeRedirectResponse( stripeResponse.redirect_url );
+		.then( ( response ) => {
+			if ( ! response || ! ( 'redirect_url' in response ) || ! response.redirect_url ) {
+				return makeSuccessResponse( response );
 			}
-			debug( 'transaction was successful' );
-			return makeSuccessResponse( stripeResponse );
+			if ( ! doesTransactionResponseRequire3DS( response ) ) {
+				return makeRedirectResponse( response.redirect_url );
+			}
+			return makeSuccessResponse( response );
 		} )
 		.catch( ( error: Error ) => {
 			debug( 'transaction failed' );
diff --git a/client/my-sites/checkout/src/lib/generic-redirect-processor.ts b/client/my-sites/checkout/src/lib/generic-redirect-processor.ts
index 934cbbf04e6b0..1b82c38a1810c 100644
--- a/client/my-sites/checkout/src/lib/generic-redirect-processor.ts
+++ b/client/my-sites/checkout/src/lib/generic-redirect-processor.ts
@@ -76,10 +76,10 @@ export default async function genericRedirectProcessor(
 
 	return submitWpcomTransaction( formattedTransactionData, transactionOptions )
 		.then( ( response?: WPCOMTransactionEndpointResponse ) => {
-			if ( ! response?.redirect_url ) {
-				throw new Error( 'Error during transaction' );
+			if ( ! response || ! ( 'redirect_url' in response ) || ! response.redirect_url ) {
+				throw new Error( 'Error during transaction: no redirect URL' );
 			}
-			return makeRedirectResponse( response?.redirect_url );
+			return makeRedirectResponse( response.redirect_url );
 		} )
 		.catch( ( error ) => makeErrorResponse( error.message ) );
 }
diff --git a/client/my-sites/checkout/src/lib/multi-partner-card-processor.ts b/client/my-sites/checkout/src/lib/multi-partner-card-processor.ts
index 984f042115229..0a471a76ffb05 100644
--- a/client/my-sites/checkout/src/lib/multi-partner-card-processor.ts
+++ b/client/my-sites/checkout/src/lib/multi-partner-card-processor.ts
@@ -159,11 +159,14 @@ async function stripeCardProcessor(
 			}
 			return stripeResponse;
 		} )
-		.then( ( stripeResponse ) => {
-			if ( stripeResponse.redirect_url && ! doesTransactionResponseRequire3DS( stripeResponse ) ) {
-				return makeRedirectResponse( stripeResponse.redirect_url );
+		.then( ( response ) => {
+			if ( ! response || ! ( 'redirect_url' in response ) || ! response.redirect_url ) {
+				return makeSuccessResponse( response );
 			}
-			return makeSuccessResponse( stripeResponse );
+			if ( ! doesTransactionResponseRequire3DS( response ) ) {
+				return makeRedirectResponse( response.redirect_url );
+			}
+			return makeSuccessResponse( response );
 		} )
 		.catch( ( error: Error ) => {
 			debug( 'transaction failed' );
diff --git a/client/my-sites/checkout/src/lib/pix-processor.ts b/client/my-sites/checkout/src/lib/pix-processor.ts
index 3669f6c4a352e..0e1da0c69f9b2 100644
--- a/client/my-sites/checkout/src/lib/pix-processor.ts
+++ b/client/my-sites/checkout/src/lib/pix-processor.ts
@@ -109,7 +109,7 @@ export async function pixProcessor(
 
 	return submitWpcomTransaction( formattedTransactionData, options )
 		.then( async ( response?: WPCOMTransactionEndpointResponse ) => {
-			if ( ! response?.redirect_url ) {
+			if ( ! response || ! ( 'redirect_url' in response ) || ! response.redirect_url ) {
 				// eslint-disable-next-line no-console
 				console.error( 'Transaction response was missing required redirect url' );
 				throw new Error( genericErrorMessage );
diff --git a/client/my-sites/checkout/src/lib/we-chat-processor.ts b/client/my-sites/checkout/src/lib/we-chat-processor.ts
index 9c6239676b086..4e85504b426a0 100644
--- a/client/my-sites/checkout/src/lib/we-chat-processor.ts
+++ b/client/my-sites/checkout/src/lib/we-chat-processor.ts
@@ -95,7 +95,7 @@ export default async function weChatProcessor(
 
 	return submitWpcomTransaction( formattedTransactionData, options )
 		.then( async ( response?: WPCOMTransactionEndpointResponse ) => {
-			if ( ! response?.redirect_url ) {
+			if ( ! response || ! ( 'redirect_url' in response ) || ! response.redirect_url ) {
 				// eslint-disable-next-line no-console
 				console.error( 'Transaction response was missing required redirect url' );
 				throw new Error( genericErrorMessage );