diff --git a/classes/requests/class-kp-requests.php b/classes/requests/class-kp-requests.php
index eb03a290..26fcaf49 100644
--- a/classes/requests/class-kp-requests.php
+++ b/classes/requests/class-kp-requests.php
@@ -76,9 +76,10 @@ public function __construct( $arguments ) {
 	 */
 	protected function get_base_url( $country, $settings ) {
 		$country_data = KP_Form_Fields::$kp_form_auto_countries[ strtolower( $country ?? '' ) ] ?? null;
+		$testmode     = wc_string_to_bool( $settings['testmode'] ?? 'no' ); // Get the testmode setting.
 
 		$region     = strtolower( apply_filters( 'klarna_base_region', $country_data['endpoint'] ?? '' ) ); // Get the region from the country parameters, blank for EU.
-		$playground = 'yes' === $settings['testmode'] ? '.playground' : ''; // If testmode is enabled, add playground to the subdomain.
+		$playground = $testmode ? '.playground' : ''; // If testmode is enabled, add playground to the subdomain.
 		$subdomain  = "api{$region}{$playground}"; // Combine the string to one subdomain.
 
 		return "https://{$subdomain}.klarna.com/"; // Return the full base url for the api.
@@ -90,13 +91,14 @@ protected function get_base_url( $country, $settings ) {
 	public function set_credentials() {
 		$country     = strtolower( $this->arguments['country'] ) ?? strtolower( kp_get_klarna_country() ); // Get the country from the arguments, or the fetch from helper method.
 		$combined_eu = isset( $this->settings['combine_eu_credentials'] ) ? ( 'yes' === $this->settings['combine_eu_credentials'] ) : false; // Check if we should combine the EU credentials.
+		$testmode    = wc_string_to_bool( $this->settings['testmode'] ?? 'no' ); // Get the testmode setting.
 
 		// If the country is a EU country, check if we should get the credentials from the EU settings.
 		if ( $combined_eu && key_exists( $country, KP_Form_Fields::available_countries( 'eu' ) ) ) {
 			$country = 'eu';
 		}
 
-		$prefix = 'yes' === $this->settings['testmode'] ? 'test_' : ''; // If testmode is enabled, add test_ to the setting strings.
+		$prefix = $testmode ? 'test_' : ''; // If testmode is enabled, add test_ to the setting strings.
 
 		$merchant_id   = "{$prefix}merchant_id_{$country}";
 		$shared_secret = "{$prefix}shared_secret_{$country}";
diff --git a/includes/kp-functions.php b/includes/kp-functions.php
index 5e74f522..37df5949 100644
--- a/includes/kp-functions.php
+++ b/includes/kp-functions.php
@@ -83,7 +83,9 @@ function kp_get_klarna_country( $order = false ) {
  * @return void
  */
 function kp_save_order_meta_data( $order, $response ) {
-	$environment = 'yes' === get_option( 'woocommerce_klarna_payments_settings' )['testmode'] ? 'test' : 'live';
+	$settings    = get_option( 'woocommerce_klarna_payments_settings', array() );
+	$testmode    = wc_string_to_bool( $settings['testmode'] ?? 'no' );
+	$environment = $testmode ? 'test' : 'live';
 
 	$klarna_country = kp_get_klarna_country( $order );
 
@@ -340,7 +342,7 @@ function kp_is_country_available( $country ) {
 	$country = strtolower( $country );
 	if ( empty( $available_countries ) ) {
 		// See if the country has values saved from the old settings, before the available countries setting was added.
-		$testmode = $settings['testmode'] ?? 'no';
+		$testmode = wc_string_to_bool( $settings['testmode'] ?? 'no' );
 		$prefix   = $testmode ? 'test_' : '';
 
 		// If the country is a EU country, check if we are using the combined EU credentials.
diff --git a/klarna-payments-for-woocommerce.php b/klarna-payments-for-woocommerce.php
index b5ba1fc2..aa8c0ef5 100644
--- a/klarna-payments-for-woocommerce.php
+++ b/klarna-payments-for-woocommerce.php
@@ -5,12 +5,12 @@
  * Description: Provides Klarna Payments as payment method to WooCommerce.
  * Author: klarna
  * Author URI: https://www.klarna.com/
- * Version: 3.7.2
+ * Version: 3.7.3
  * Text Domain: klarna-payments-for-woocommerce
  * Domain Path: /languages
  *
  * WC requires at least: 5.6.0
- * WC tested up to: 9.2.3
+ * WC tested up to: 9.3.1
  * Requires Plugins: woocommerce
  *
  * Copyright (c) 2017-2024 Krokedil
@@ -42,7 +42,7 @@
 /**
  * Required minimums and constants
  */
-define( 'WC_KLARNA_PAYMENTS_VERSION', '3.7.2' );
+define( 'WC_KLARNA_PAYMENTS_VERSION', '3.7.3' );
 define( 'WC_KLARNA_PAYMENTS_MIN_PHP_VER', '7.4.0' );
 define( 'WC_KLARNA_PAYMENTS_MIN_WC_VER', '5.6.0' );
 define( 'WC_KLARNA_PAYMENTS_MAIN_FILE', __FILE__ );
diff --git a/readme.txt b/readme.txt
index 195c9fdd..7c2c7acc 100644
--- a/readme.txt
+++ b/readme.txt
@@ -7,7 +7,7 @@ Tested up to: 6.6.2
 Requires PHP: 7.4
 WC requires at least: 5.6.0
 WC tested up to: 9.2.3
-Stable tag: 3.7.2
+Stable tag: 3.7.3
 License: GPLv3 or later
 License URI: http://www.gnu.org/licenses/gpl-3.0.html
 
@@ -51,6 +51,9 @@ For help setting up and configuring Klarna Payments for WooCommerce please refer
 
 
 == Changelog ==
+= 2024.09.13    - version 3.7.3 =
+* Fix           - Fix an issue with getting the correct credentials in some cases when not using the combined setting for EU countries.
+
 = 2024.09.12    - version 3.7.2 =
 * Fix           - Fixed a undefined index warning related to new settings.