diff --git a/changelog.txt b/changelog.txt
index 8da100f1f2..a25100812b 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,6 +1,7 @@
 *** Changelog ***
 
 = 10.1.0 - xxxx-xx-xx =
+* Update - Renames and migrates all Payment Request Buttons settings to Express Checkout
 * Add - Add a new filter allowing third-party plugins to hook captcha solutions when creating and confirming setup intents
 * Dev - Add track events when clicking the "Reconnect to Stripe" button (both in the settings page and the admin notice)
 * Update - Removes unnecessary legacy checkout gateway instantiations and UPE disablement code
diff --git a/includes/admin/class-wc-rest-stripe-settings-controller.php b/includes/admin/class-wc-rest-stripe-settings-controller.php
index e02906536f..4daa684182 100644
--- a/includes/admin/class-wc-rest-stripe-settings-controller.php
+++ b/includes/admin/class-wc-rest-stripe-settings-controller.php
@@ -109,20 +109,20 @@ public function register_routes() {
 					'payment_request_button_type'      => [
 						'description'       => __( 'Express checkout button types.', 'woocommerce-gateway-stripe' ),
 						'type'              => 'string',
-						'enum'              => array_keys( $form_fields['payment_request_button_type']['options'] ),
+						'enum'              => array_keys( $form_fields['express_checkout_button_type']['options'] ),
 						'validate_callback' => 'rest_validate_request_arg',
 					],
 					'payment_request_button_theme'     => [
 						'description'       => __( 'Express checkout button themes.', 'woocommerce-gateway-stripe' ),
 						'type'              => 'string',
-						'enum'              => array_keys( $form_fields['payment_request_button_theme']['options'] ),
+						'enum'              => array_keys( $form_fields['express_checkout_button_theme']['options'] ),
 						'validate_callback' => 'rest_validate_request_arg',
 					],
 					'payment_request_button_size'      => [
 						'description'       => __( 'Express checkout button sizes.', 'woocommerce-gateway-stripe' ),
 						'type'              => 'string',
-						// it can happen that `$form_fields['payment_request_button_size']` is empty (in tests) - fixing temporarily.
-						'enum'              => array_keys( isset( $form_fields['payment_request_button_size']['options'] ) ? $form_fields['payment_request_button_size']['options'] : [] ),
+						// it can happen that `$form_fields['express_checkout_button_size']` is empty (in tests) - fixing temporarily.
+						'enum'              => array_keys( isset( $form_fields['express_checkout_button_size']['options'] ) ? $form_fields['express_checkout_button_size']['options'] : [] ),
 						'validate_callback' => 'rest_validate_request_arg',
 					],
 					'payment_request_button_locations' => [
@@ -130,7 +130,7 @@ public function register_routes() {
 						'type'              => 'array',
 						'items'             => [
 							'type' => 'string',
-							'enum' => array_keys( $form_fields['payment_request_button_locations']['options'] ),
+							'enum' => array_keys( $form_fields['express_checkout_button_locations']['options'] ),
 						],
 						'validate_callback' => 'rest_validate_request_arg',
 					],
@@ -237,10 +237,10 @@ public function get_settings() {
 				'amazon_pay_button_size'                   => $this->gateway->get_validated_option( 'amazon_pay_button_size' ),
 				'amazon_pay_button_locations'              => $this->gateway->get_validated_option( 'amazon_pay_button_locations' ),
 				'is_payment_request_enabled'               => $this->gateway->is_payment_request_enabled(),
-				'payment_request_button_type'              => $this->gateway->get_validated_option( 'payment_request_button_type' ),
-				'payment_request_button_theme'             => $this->gateway->get_validated_option( 'payment_request_button_theme' ),
-				'payment_request_button_size'              => $this->gateway->get_validated_option( 'payment_request_button_size' ),
-				'payment_request_button_locations'         => $this->gateway->get_validated_option( 'payment_request_button_locations' ),
+				'payment_request_button_type'              => $this->gateway->get_validated_option( 'express_checkout_button_type' ),
+				'payment_request_button_theme'             => $this->gateway->get_validated_option( 'express_checkout_button_theme' ),
+				'payment_request_button_size'              => $this->gateway->get_validated_option( 'express_checkout_button_size' ),
+				'payment_request_button_locations'         => $this->gateway->get_validated_option( 'express_checkout_button_locations' ),
 
 				/* Settings > Payments & transactions */
 				'is_manual_capture_enabled'                => ! $this->gateway->is_automatic_capture_enabled(),
@@ -540,10 +540,10 @@ private function update_amazon_pay_settings( WP_REST_Request $request ) {
 	 */
 	private function update_payment_request_settings( WP_REST_Request $request ) {
 		$attributes = [
-			'payment_request_button_type'      => 'payment_request_button_type',
-			'payment_request_button_size'      => 'payment_request_button_size',
-			'payment_request_button_theme'     => 'payment_request_button_theme',
-			'payment_request_button_locations' => 'payment_request_button_locations',
+			'payment_request_button_type'      => 'express_checkout_button_type',
+			'payment_request_button_size'      => 'express_checkout_button_size',
+			'payment_request_button_theme'     => 'express_checkout_button_theme',
+			'payment_request_button_locations' => 'express_checkout_button_locations',
 		];
 
 		foreach ( $attributes as $request_key => $attribute ) {
diff --git a/includes/admin/class-wc-stripe-inbox-notes.php b/includes/admin/class-wc-stripe-inbox-notes.php
index 8542ae4513..12663be822 100644
--- a/includes/admin/class-wc-stripe-inbox-notes.php
+++ b/includes/admin/class-wc-stripe-inbox-notes.php
@@ -124,7 +124,7 @@ public static function should_show_marketing_note() {
 		// Make sure Apple Pay is enabled and setup is successful.
 		$stripe_settings       = WC_Stripe_Helper::get_stripe_settings();
 		$stripe_enabled        = isset( $stripe_settings['enabled'] ) && 'yes' === $stripe_settings['enabled'];
-		$button_enabled        = isset( $stripe_settings['payment_request'] ) && 'yes' === $stripe_settings['payment_request'];
+		$button_enabled        = isset( $stripe_settings['express_checkout'] ) && 'yes' === $stripe_settings['express_checkout'];
 		$registration_complete = isset( $stripe_settings['apple_pay_domain_set'] ) && 'yes' === $stripe_settings['apple_pay_domain_set'];
 		if ( ! $stripe_enabled || ! $button_enabled || ! $registration_complete ) {
 			return false;
diff --git a/includes/admin/class-wc-stripe-payment-gateways-controller.php b/includes/admin/class-wc-stripe-payment-gateways-controller.php
index 1fbc516612..e9a1b6305e 100644
--- a/includes/admin/class-wc-stripe-payment-gateways-controller.php
+++ b/includes/admin/class-wc-stripe-payment-gateways-controller.php
@@ -19,7 +19,7 @@ public function __construct() {
 		// If UPE is enabled and there are enabled payment methods, we need to load the disable Stripe confirmation modal.
 		$stripe_settings              = WC_Stripe_Helper::get_stripe_settings();
 		$enabled_upe_payment_methods  = WC_Stripe_Payment_Method_Configurations::get_upe_enabled_payment_method_ids();
-		$upe_payment_requests_enabled = 'yes' === ( $stripe_settings['payment_request'] ?? 'no' );
+		$upe_payment_requests_enabled = 'yes' === ( $stripe_settings['express_checkout'] ?? 'no' );
 
 		if ( ( is_array( $enabled_upe_payment_methods ) && count( $enabled_upe_payment_methods ) > 0 ) || $upe_payment_requests_enabled ) {
 			add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_payments_scripts' ] );
diff --git a/includes/admin/stripe-settings.php b/includes/admin/stripe-settings.php
index b2ba9ffda3..dc76c8c5a5 100644
--- a/includes/admin/stripe-settings.php
+++ b/includes/admin/stripe-settings.php
@@ -117,7 +117,7 @@
 			'default'     => 'yes',
 			'desc_tip'    => true,
 		],
-		'payment_request'                     => [
+		'express_checkout'                     => [
 			'title'       => __( 'Payment Request Buttons', 'woocommerce-gateway-stripe' ),
 			'label'       => sprintf(
 				/* translators: 1) br tag 2) Stripe anchor tag 3) Apple anchor tag 4) Stripe dashboard opening anchor tag 5) Stripe dashboard closing anchor tag */
@@ -133,7 +133,7 @@
 			'default'     => 'yes',
 			'desc_tip'    => true,
 		],
-		'payment_request_button_type'         => [
+		'express_checkout_button_type'         => [
 			'title'       => __( 'Payment Request Button Type', 'woocommerce-gateway-stripe' ),
 			'label'       => __( 'Button Type', 'woocommerce-gateway-stripe' ),
 			'type'        => 'select',
@@ -148,7 +148,7 @@
 				'custom'  => __( 'Custom', 'woocommerce-gateway-stripe' ),
 			],
 		],
-		'payment_request_button_theme'        => [
+		'express_checkout_button_theme'        => [
 			'title'       => __( 'Payment Request Button Theme', 'woocommerce-gateway-stripe' ),
 			'label'       => __( 'Button Theme', 'woocommerce-gateway-stripe' ),
 			'type'        => 'select',
@@ -189,7 +189,7 @@
 				'long'  => __( 'Text and logo', 'woocommerce-gateway-stripe' ),
 			],
 		],
-		'payment_request_button_locations'    => [
+		'express_checkout_button_locations'    => [
 			'title'             => __( 'Payment Request Button Locations', 'woocommerce-gateway-stripe' ),
 			'type'              => 'multiselect',
 			'description'       => __( 'Select where you would like Payment Request Buttons to be displayed', 'woocommerce-gateway-stripe' ),
@@ -205,7 +205,7 @@
 				'data-placeholder' => __( 'Select pages', 'woocommerce-gateway-stripe' ),
 			],
 		],
-		'payment_request_button_size'         => [
+		'express_checkout_button_size'         => [
 			'title'       => __( 'Payment Request Button Size', 'woocommerce-gateway-stripe' ),
 			'type'        => 'select',
 			'description' => __( 'Select the size of the button.', 'woocommerce-gateway-stripe' ),
@@ -293,20 +293,20 @@
 
 if ( WC_Stripe_Feature_Flags::is_upe_preview_enabled() ) {
 	// in the new settings, "checkout" is going to be enabled by default (if it is a new WCStripe installation).
-	$stripe_settings['payment_request_button_locations']['default'][] = 'checkout';
+	$stripe_settings['express_checkout_button_locations']['default'][] = 'checkout';
 
 	// no longer needed in the new settings.
-	unset( $stripe_settings['payment_request_button_branded_type'] );
-	unset( $stripe_settings['payment_request_button_height'] );
-	unset( $stripe_settings['payment_request_button_label'] );
+	unset( $stripe_settings['express_checkout_button_branded_type'] );
+	unset( $stripe_settings['express_checkout_button_height'] );
+	unset( $stripe_settings['express_checkout_button_label'] );
 	// injecting some of the new options.
-	$stripe_settings['payment_request_button_type']['options']['default'] = __( 'Only icon', 'woocommerce-gateway-stripe' );
-	$stripe_settings['payment_request_button_type']['options']['book']    = __( 'Book', 'woocommerce-gateway-stripe' );
+	$stripe_settings['express_checkout_button_type']['options']['default'] = __( 'Only icon', 'woocommerce-gateway-stripe' );
+	$stripe_settings['express_checkout_button_type']['options']['book']    = __( 'Book', 'woocommerce-gateway-stripe' );
 	// no longer valid options.
-	unset( $stripe_settings['payment_request_button_type']['options']['branded'] );
-	unset( $stripe_settings['payment_request_button_type']['options']['custom'] );
+	unset( $stripe_settings['express_checkout_button_type']['options']['branded'] );
+	unset( $stripe_settings['express_checkout_button_type']['options']['custom'] );
 } else {
-	unset( $stripe_settings['payment_request_button_size'] );
+	unset( $stripe_settings['express_checkout_button_size'] );
 }
 
 if ( WC_Stripe_Feature_Flags::is_upe_preview_enabled() ) {
diff --git a/includes/class-wc-gateway-stripe.php b/includes/class-wc-gateway-stripe.php
index 35f342e4a3..69403d0b6f 100644
--- a/includes/class-wc-gateway-stripe.php
+++ b/includes/class-wc-gateway-stripe.php
@@ -116,7 +116,7 @@ public function __construct() {
 		$this->saved_cards          = 'yes' === $this->get_option( 'saved_cards' );
 		$this->secret_key           = $this->testmode ? $this->get_validated_option( 'test_secret_key' ) : $this->get_validated_option( 'secret_key' );
 		$this->publishable_key      = $this->testmode ? $this->get_validated_option( 'test_publishable_key' ) : $this->get_validated_option( 'publishable_key' );
-		$this->payment_request      = 'yes' === $this->get_option( 'payment_request', 'yes' );
+		$this->payment_request      = 'yes' === $this->get_option( 'express_checkout', 'yes' );
 
 		WC_Stripe_API::set_secret_key( $this->secret_key );
 
@@ -1236,7 +1236,7 @@ private function validate_field( $field_key, $field_value ) {
 	 * @return bool
 	 */
 	public function is_payment_request_enabled() {
-		return 'yes' === $this->get_option( 'payment_request' );
+		return 'yes' === $this->get_option( 'express_checkout' );
 	}
 
 	/**
diff --git a/includes/class-wc-stripe-helper.php b/includes/class-wc-stripe-helper.php
index 97d56d5024..52e57e5503 100644
--- a/includes/class-wc-stripe-helper.php
+++ b/includes/class-wc-stripe-helper.php
@@ -1285,8 +1285,8 @@ public static function should_load_scripts_on_cart_page() {
 	private static function should_load_scripts_for_prb_location( $location ) {
 		// Make sure location parameter is sanitized.
 		$location         = in_array( $location, [ 'product', 'cart' ], true ) ? $location : '';
-		$are_prbs_enabled = self::get_settings( null, 'payment_request' ) ?? 'yes';
-		$prb_locations    = self::get_settings( null, 'payment_request_button_locations' ) ?? [ 'product', 'cart' ];
+		$are_prbs_enabled = self::get_settings( null, 'express_checkout' ) ?? 'yes';
+		$prb_locations    = self::get_settings( null, 'express_checkout_button_locations' ) ?? [ 'product', 'cart' ];
 
 		// The scripts should be loaded when all of the following are true:
 		//   1. The PRBs are enabled; and
diff --git a/includes/class-wc-stripe-payment-method-configurations.php b/includes/class-wc-stripe-payment-method-configurations.php
index 1facd6d370..7e12203ed3 100644
--- a/includes/class-wc-stripe-payment-method-configurations.php
+++ b/includes/class-wc-stripe-payment-method-configurations.php
@@ -538,7 +538,7 @@ public static function maybe_migrate_payment_methods_from_db_to_pmc( $force_migr
 		}
 
 		// Add Google Pay and Apple Pay to the list if payment_request is enabled
-		if ( ! empty( $stripe_settings['payment_request'] ) && 'yes' === $stripe_settings['payment_request'] ) {
+		if ( ! empty( $stripe_settings['express_checkout'] ) && 'yes' === $stripe_settings['express_checkout'] ) {
 			$enabled_payment_methods = array_merge(
 				$enabled_payment_methods,
 				[ WC_Stripe_Payment_Methods::GOOGLE_PAY, WC_Stripe_Payment_Methods::APPLE_PAY ]
diff --git a/includes/class-wc-stripe.php b/includes/class-wc-stripe.php
index 4cae23488c..a92196e66e 100644
--- a/includes/class-wc-stripe.php
+++ b/includes/class-wc-stripe.php
@@ -217,8 +217,7 @@ public function init() {
 		require_once WC_STRIPE_PLUGIN_PATH . '/includes/class-wc-stripe-account.php';
 
 		new Allowed_Payment_Request_Button_Types_Update();
-		// TODO: Temporary disabling the migration as it has a conflict with the new UPE checkout.
-		// new Migrate_Payment_Request_Data_To_Express_Checkout_Data();
+		new Migrate_Payment_Request_Data_To_Express_Checkout_Data();
 		new Sepa_Tokens_For_Other_Methods_Settings_Update();
 
 		$this->api                           = new WC_Stripe_Connect_API();
@@ -415,8 +414,8 @@ public function migrate_to_new_checkout_experience() {
 	 */
 	public function update_prb_location_settings() {
 		$stripe_settings = WC_Stripe_Helper::get_stripe_settings();
-		$prb_locations   = isset( $stripe_settings['payment_request_button_locations'] )
-			? $stripe_settings['payment_request_button_locations']
+		$prb_locations   = isset( $stripe_settings['express_checkout_button_locations'] )
+			? $stripe_settings['express_checkout_button_locations']
 			: [];
 		if ( ! empty( $stripe_settings ) && empty( $prb_locations ) ) {
 			global $post;
@@ -439,7 +438,7 @@ public function update_prb_location_settings() {
 				$new_prb_locations[] = 'checkout';
 			}
 
-			$stripe_settings['payment_request_button_locations'] = $new_prb_locations;
+			$stripe_settings['express_checkout_button_locations'] = $new_prb_locations;
 			WC_Stripe_Helper::update_main_stripe_settings( $stripe_settings );
 		}
 	}
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 b6f826bd9e..170a0e2f77 100644
--- a/includes/payment-methods/class-wc-stripe-express-checkout-helper.php
+++ b/includes/payment-methods/class-wc-stripe-express-checkout-helper.php
@@ -108,7 +108,7 @@ public function is_account_creation_possible() {
 	 * @return  string
 	 */
 	public function get_button_type() {
-		return isset( $this->stripe_settings['payment_request_button_type'] ) ? $this->stripe_settings['payment_request_button_type'] : 'default';
+		return isset( $this->stripe_settings['express_checkout_button_type'] ) ? $this->stripe_settings['express_checkout_button_type'] : 'default';
 	}
 
 	/**
@@ -117,7 +117,7 @@ public function get_button_type() {
 	 * @return  string
 	 */
 	public function get_button_theme() {
-		return isset( $this->stripe_settings['payment_request_button_theme'] ) ? $this->stripe_settings['payment_request_button_theme'] : 'dark';
+		return isset( $this->stripe_settings['express_checkout_button_theme'] ) ? $this->stripe_settings['express_checkout_button_theme'] : 'dark';
 	}
 
 	/**
@@ -126,7 +126,7 @@ public function get_button_theme() {
 	 * @return  string
 	 */
 	public function get_button_height() {
-		$height = isset( $this->stripe_settings['payment_request_button_size'] ) ? $this->stripe_settings['payment_request_button_size'] : 'default';
+		$height = isset( $this->stripe_settings['express_checkout_button_size'] ) ? $this->stripe_settings['express_checkout_button_size'] : 'default';
 		if ( 'small' === $height ) {
 			return '40';
 		}
@@ -144,7 +144,7 @@ public function get_button_height() {
 	 * @return string
 	 */
 	public function get_button_radius() {
-		$height = isset( $this->stripe_settings['payment_request_button_size'] ) ? $this->stripe_settings['payment_request_button_size'] : 'default';
+		$height = isset( $this->stripe_settings['express_checkout_button_size'] ) ? $this->stripe_settings['express_checkout_button_size'] : 'default';
 		if ( 'small' === $height ) {
 			return '2';
 		}
@@ -1553,18 +1553,18 @@ public function get_login_confirmation_settings() {
 	 */
 	public function get_button_locations() {
 		// If the locations have not been set return the default setting.
-		if ( ! isset( $this->stripe_settings['payment_request_button_locations'] ) ) {
+		if ( ! isset( $this->stripe_settings['express_checkout_button_locations'] ) ) {
 			return [ 'product', 'cart' ];
 		}
 
 		// If all locations are removed through the settings UI the location config will be set to
 		// an empty string "". If that's the case (and if the settings are not an array for any
 		// other reason) we should return an empty array.
-		if ( ! is_array( $this->stripe_settings['payment_request_button_locations'] ) ) {
+		if ( ! is_array( $this->stripe_settings['express_checkout_button_locations'] ) ) {
 			return [];
 		}
 
-		return $this->stripe_settings['payment_request_button_locations'];
+		return $this->stripe_settings['express_checkout_button_locations'];
 	}
 
 	/**
diff --git a/readme.txt b/readme.txt
index 7325de95ad..31db5a00f7 100644
--- a/readme.txt
+++ b/readme.txt
@@ -111,6 +111,7 @@ If you get stuck, you can ask for help in the [Plugin Forum](https://wordpress.o
 == Changelog ==
 
 = 10.1.0 - xxxx-xx-xx =
+* Update - Renames and migrates all Payment Request Buttons settings to Express Checkout
 * Add - Add a new filter allowing third-party plugins to hook captcha solutions when creating and confirming setup intents
 * Dev - Add track events when clicking the "Reconnect to Stripe" button (both in the settings page and the admin notice)
 * Update - Removes unnecessary legacy checkout gateway instantiations and UPE disablement code
diff --git a/tests/phpunit/Admin/Migrations/Migrate_Payment_Methods_From_DB_To_PMC_Test.php b/tests/phpunit/Admin/Migrations/Migrate_Payment_Methods_From_DB_To_PMC_Test.php
index e59a2fba3b..d39f076a88 100644
--- a/tests/phpunit/Admin/Migrations/Migrate_Payment_Methods_From_DB_To_PMC_Test.php
+++ b/tests/phpunit/Admin/Migrations/Migrate_Payment_Methods_From_DB_To_PMC_Test.php
@@ -53,7 +53,7 @@ public function test_migration_executed_when_pmc_enabled_is_not_set() {
 		// Set pmc_enabled to '' to trigger migration
 		$stripe_settings = WC_Stripe_Helper::get_stripe_settings();
 		$stripe_settings['test_connection_type']                      = 'connect';
-		$stripe_settings['payment_request']                           = 'yes';
+		$stripe_settings['express_checkout']                          = 'yes';
 		$stripe_settings['upe_checkout_experience_accepted_payments'] = [ 'link', 'sepa_debit' ];
 		$stripe_settings['pmc_enabled']                               = '';
 		WC_Stripe_Helper::update_main_stripe_settings( $stripe_settings );
diff --git a/tests/phpunit/Admin/WC_REST_Stripe_Settings_Controller_Test.php b/tests/phpunit/Admin/WC_REST_Stripe_Settings_Controller_Test.php
index be66b40049..9a34088a18 100644
--- a/tests/phpunit/Admin/WC_REST_Stripe_Settings_Controller_Test.php
+++ b/tests/phpunit/Admin/WC_REST_Stripe_Settings_Controller_Test.php
@@ -183,6 +183,15 @@ public function test_boolean_fields( $rest_key, $option_name, $inverse = false )
 	}
 
 	/**
+	 * Tests for enum fields.
+	 *
+	 * @param string       $rest_key             REST API key.
+	 * @param string       $option_name          Option name.
+	 * @param string|array $original_valid_value Original valid value.
+	 * @param string|array $new_valid_value      New valid value.
+	 * @param string|array $new_invalid_value    New invalid value.
+	 * @param bool         $is_upe_enabled       Whether UPE is enabled.
+	 *
 	 * @dataProvider enum_field_provider
 	 */
 	public function test_enum_fields( $rest_key, $option_name, $original_valid_value, $new_valid_value, $new_invalid_value, $is_upe_enabled = true ) {
@@ -508,28 +517,6 @@ public function is_payment_request_enabled_provider() {
 		];
 	}
 
-	/**
-	 * @dataProvider is_payment_request_enabled_legacy_provider
-	 */
-	public function test_is_payment_request_enabled_legacy( $is_enabled, $option_value ) {
-		// Settings controller with non-UPE gateway.
-		$gateway = new WC_Stripe_UPE_Payment_Gateway();
-		$gateway->update_option( 'payment_request', $option_value );
-		$controller = new WC_REST_Stripe_Settings_Controller( $gateway );
-
-		$request  = new WP_REST_Request( 'GET', self::SETTINGS_ROUTE );
-		$response = $controller->get_settings( $request );
-		$this->assertEquals( 200, $response->get_status() );
-		$this->assertEquals( $is_enabled, $response->get_data()['is_payment_request_enabled'] );
-	}
-
-	public function is_payment_request_enabled_legacy_provider() {
-		return [
-			[ true, 'yes' ],
-			[ false, 'no' ],
-		];
-	}
-
 	public function boolean_field_provider() {
 		return [
 			'is_stripe_enabled'                     => [ 'is_stripe_enabled', 'enabled' ],
@@ -553,32 +540,37 @@ public function stripe_payment_method_configurations_provider() {
 		];
 	}
 
+	/**
+	 * Data provider for `test_enum_fields`.
+	 *
+	 * @return array
+	 */
 	public function enum_field_provider() {
 		return [
 			'payment_request_button_theme'     => [
 				'payment_request_button_theme',
-				'payment_request_button_theme',
+				'express_checkout_button_theme',
 				'dark',
 				'light',
 				'foo',
 			],
 			'payment_request_button_size'      => [
 				'payment_request_button_size',
-				'payment_request_button_size',
+				'express_checkout_button_size',
 				'default',
 				'large',
 				'foo',
 			],
 			'payment_request_button_type'      => [
 				'payment_request_button_type',
-				'payment_request_button_type',
+				'express_checkout_button_type',
 				'buy',
 				'book',
 				'foo',
 			],
 			'payment_request_button_locations' => [
 				'payment_request_button_locations',
-				'payment_request_button_locations',
+				'express_checkout_button_locations',
 				[ 'cart' ],
 				[ 'cart', 'checkout', 'product' ],
 				[ 'foo' ],
diff --git a/tests/phpunit/WC_Stripe_Apple_Pay_Registration_Test.php b/tests/phpunit/WC_Stripe_Apple_Pay_Registration_Test.php
index 1be0b9c487..0573946e09 100644
--- a/tests/phpunit/WC_Stripe_Apple_Pay_Registration_Test.php
+++ b/tests/phpunit/WC_Stripe_Apple_Pay_Registration_Test.php
@@ -55,21 +55,6 @@ public function set_up() {
 		$this->upe_helper = new UPE_Test_Helper();
 	}
 
-	/**
-	 * Disable UPE and enable/disable Apple Pay/Google Pay.
-	 *
-	 * @param bool $payment_request_enabled Whether Apple Pay/Google Pay should be enabled.
-	 */
-	private function legacy_checkout_setup( $payment_request_enabled = true ) {
-		$this->upe_helper->disable_upe();
-		$this->upe_helper->reload_payment_gateways();
-
-		$settings                    = WC_Stripe_Helper::get_stripe_settings();
-		$settings['payment_request'] = $payment_request_enabled ? 'yes' : 'no';
-		WC_Stripe_Helper::update_main_stripe_settings( $settings );
-		WC_Stripe::get_instance()->get_main_stripe_gateway()->init_settings();
-	}
-
 	/**
 	 * Enable UPE and enable/disable Apple Pay/Google Pay.
 	 *
@@ -86,20 +71,6 @@ private function upe_checkout_setup( $payment_request_enabled = true ) {
 		}
 	}
 
-	public function test_register_domain_if_configured_no_secret_key() {
-		$this->legacy_checkout_setup( true );
-
-		$this->mock_wc_apple_pay_registration
-			->expects( $this->never() )
-			->method( 'register_domain' );
-
-		$settings = WC_Stripe_Helper::get_stripe_settings();
-		unset( $settings['test_secret_key'] );
-		WC_Stripe_Helper::update_main_stripe_settings( $settings );
-
-		$this->mock_wc_apple_pay_registration->register_domain_if_configured();
-	}
-
 	public function test_register_domain_if_configured_supported_country() {
 		$this->upe_checkout_setup();
 
@@ -124,43 +95,6 @@ public function test_register_domain_if_configured_supported_country() {
 		$this->mock_wc_apple_pay_registration->register_domain_if_configured();
 	}
 
-	public function test_register_domain_if_configured_unsupported_country() {
-		$this->legacy_checkout_setup( true );
-
-		WC_Stripe::get_instance()->account = $this->getMockBuilder( 'WC_Stripe_Account' )
-			->disableOriginalConstructor()
-			->setMethods(
-				[
-					'get_cached_account_data',
-				]
-			)
-			->getMock();
-
-		WC_Stripe::get_instance()->account
-			->expects( $this->any() )
-			->method( 'get_cached_account_data' )
-			->willReturn( [ 'country' => 'IN' ] );
-
-		$this->mock_wc_apple_pay_registration
-			->expects( $this->never() )
-			->method( 'register_domain' );
-
-		$this->mock_wc_apple_pay_registration->register_domain_if_configured();
-	}
-
-	/**
-	 * Test for when Apple Pay (legacy PRB) are disabled.
-	 */
-	public function test_register_domain_if_configured_apple_pay_disabled() {
-		$this->legacy_checkout_setup( false );
-
-		$this->mock_wc_apple_pay_registration
-			->expects( $this->never() )
-			->method( 'register_domain' );
-
-		$this->mock_wc_apple_pay_registration->register_domain_if_configured();
-	}
-
 	/**
 	 * Test for UPE, Apple Pay enabled.
 	 */