diff --git a/includes/payment-methods/class-wc-stripe-express-checkout-ajax-handler.php b/includes/payment-methods/class-wc-stripe-express-checkout-ajax-handler.php
index 90312dcd04..f46d55e417 100644
--- a/includes/payment-methods/class-wc-stripe-express-checkout-ajax-handler.php
+++ b/includes/payment-methods/class-wc-stripe-express-checkout-ajax-handler.php
@@ -1,4 +1,7 @@
 <?php
+
+use Automattic\WooCommerce\Enums\ProductType;
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
@@ -92,7 +95,7 @@ public function ajax_add_to_cart() {
 		// First empty the cart to prevent wrong calculation.
 		WC()->cart->empty_cart();
 
-		if ( ( 'variable' === $product_type || 'variable-subscription' === $product_type ) && isset( $_POST['attributes'] ) ) {
+		if ( ( ProductType::VARIABLE === $product_type || 'variable-subscription' === $product_type ) && isset( $_POST['attributes'] ) ) {
 			$attributes = wc_clean( wp_unslash( $_POST['attributes'] ) );
 
 			$data_store   = WC_Data_Store::load( 'product' );
@@ -232,7 +235,7 @@ public function ajax_get_selected_product_data() {
 				throw new Exception( sprintf( __( 'Product with the ID (%1$s) cannot be found.', 'woocommerce-gateway-stripe' ), $product_id ) );
 			}
 
-			if ( in_array( $product->get_type(), [ 'variable', 'variable-subscription' ], true ) && isset( $_POST['attributes'] ) ) {
+			if ( in_array( $product->get_type(), [ ProductType::VARIABLE, 'variable-subscription' ], true ) && isset( $_POST['attributes'] ) ) {
 				$attributes = wc_clean( wp_unslash( $_POST['attributes'] ) );
 
 				$data_store   = WC_Data_Store::load( 'product' );
diff --git a/includes/payment-methods/class-wc-stripe-express-checkout-helper.php b/includes/payment-methods/class-wc-stripe-express-checkout-helper.php
index f488786420..b4d232713f 100644
--- a/includes/payment-methods/class-wc-stripe-express-checkout-helper.php
+++ b/includes/payment-methods/class-wc-stripe-express-checkout-helper.php
@@ -1,5 +1,7 @@
 <?php
 
+use Automattic\WooCommerce\Enums\ProductType;
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
@@ -225,7 +227,7 @@ public function get_product_data() {
 			return false;
 		}
 
-		if ( in_array( $product->get_type(), [ 'variable', 'variable-subscription' ], true ) ) {
+		if ( in_array( $product->get_type(), [ ProductType::VARIABLE, 'variable-subscription' ], true ) ) {
 			$variation_attributes = $product->get_variation_attributes();
 			$attributes           = [];
 
@@ -408,9 +410,9 @@ public function supported_product_types() {
 		return apply_filters(
 			'wc_stripe_payment_request_supported_types',
 			[
-				'simple',
-				'variable',
-				'variation',
+				ProductType::SIMPLE,
+				ProductType::VARIABLE,
+				ProductType::VARIATION,
 				'subscription',
 				'variable-subscription',
 				'subscription_variation',
@@ -673,7 +675,7 @@ public function should_show_express_checkout_button() {
 			return false;
 		}
 
-		if ( $is_product && $product && in_array( $product->get_type(), [ 'variable', 'variable-subscription' ], true ) ) {
+		if ( $is_product && $product && in_array( $product->get_type(), [ ProductType::VARIABLE, 'variable-subscription' ], true ) ) {
 			$stock_availability = array_column( $product->get_available_variations(), 'is_in_stock' );
 			// Don't show if all product variations are out-of-stock.
 			if ( ! in_array( true, $stock_availability, true ) ) {