diff --git a/modules/ppcp-paylater-configurator/src/Endpoint/SaveConfig.php b/modules/ppcp-paylater-configurator/src/Endpoint/SaveConfig.php
index 0b4f2eda3..7b650bc79 100644
--- a/modules/ppcp-paylater-configurator/src/Endpoint/SaveConfig.php
+++ b/modules/ppcp-paylater-configurator/src/Endpoint/SaveConfig.php
@@ -89,6 +89,11 @@ class SaveConfig {
 		}
 	}
 
+	/**
+	 * Saves the config into the old settings.
+	 *
+	 * @param array $config The configurator config.
+	 */
 	private function save_config( array $config ): void {
 		$this->settings->set( 'pay_later_enable_styling_per_messaging_location', true );
 
@@ -109,6 +114,12 @@ class SaveConfig {
 		$this->settings->persist();
 	}
 
+	/**
+	 * Saves the config for a location into the old settings.
+	 *
+	 * @param array  $config The configurator config for a location.
+	 * @param string $location The location name in the old settings.
+	 */
 	private function save_config_for_location( array $config, string $location ): void {
 		$this->set_value_if_present( $config, 'layout', "pay_later_{$location}_message_layout" );
 
@@ -121,12 +132,24 @@ class SaveConfig {
 		$this->set_value_if_present( $config, 'text-size', "pay_later_{$location}_message_text_size" );
 	}
 
+	/**
+	 * Sets the value in the settings if it is available in the config.
+	 *
+	 * @param array  $config The configurator config.
+	 * @param string $key The key in the config.
+	 * @param string $settings_key The key in the settings.
+	 */
 	private function set_value_if_present( array $config, string $key, string $settings_key ): void {
 		if ( isset( $config[ $key ] ) ) {
 			$this->settings->set( $settings_key, $config[ $key ] );
 		}
 	}
 
+	/**
+	 * Converts the configurator placement into location in the old settings.
+	 *
+	 * @param string $placement The configurator placement.
+	 */
 	private function configurator_placement_to_location( string $placement ): string {
 		switch ( $placement ) {
 			case 'cart':
diff --git a/modules/ppcp-paylater-configurator/src/Factory/ConfigFactory.php b/modules/ppcp-paylater-configurator/src/Factory/ConfigFactory.php
index 19209fb67..cb272984d 100644
--- a/modules/ppcp-paylater-configurator/src/Factory/ConfigFactory.php
+++ b/modules/ppcp-paylater-configurator/src/Factory/ConfigFactory.php
@@ -15,6 +15,11 @@ use WooCommerce\PayPalCommerce\WcGateway\Settings\Settings;
  * Class ConfigFactory.
  */
 class ConfigFactory {
+	/**
+	 * Returns the configurator config for the given old settings.
+	 *
+	 * @param Settings $settings The settings.
+	 */
 	public function from_settings( Settings $settings ): array {
 		return array(
 			$this->location_to_configurator_placement( 'cart' ) => $this->for_location( $settings, 'cart' ),
@@ -25,11 +30,17 @@ class ConfigFactory {
 		);
 	}
 
+	/**
+	 * Returns the configurator config for a location.
+	 *
+	 * @param Settings $settings The settings.
+	 * @param string   $location The location name in the old settings.
+	 */
 	private function for_location( Settings $settings, string $location ): array {
 		$selected_locations = $settings->has( 'pay_later_messaging_locations' ) ? $settings->get( 'pay_later_messaging_locations' ) : array();
 
 		$placement = $this->location_to_configurator_placement( $location );
-		if ( in_array( $placement, array( 'category', 'homepage' ) ) ) {
+		if ( in_array( $placement, array( 'category', 'homepage' ), true ) ) {
 			$config = array(
 				'layout' => 'flex',
 				'color'  => $this->get_or_default( $settings, "pay_later_{$location}_message_flex_color", 'black', array( 'black', 'blue', 'white', 'white-no-border' ) ),
@@ -48,13 +59,18 @@ class ConfigFactory {
 
 		return array_merge(
 			array(
-				'status'    => in_array( $location, $selected_locations ) ? 'enabled' : 'disabled',
+				'status'    => in_array( $location, $selected_locations, true ) ? 'enabled' : 'disabled',
 				'placement' => $placement,
 			),
 			$config
 		);
 	}
 
+	/**
+	 * Converts the location name from the old settings into the configurator placement.
+	 *
+	 * @param string $location The location name in the old settings.
+	 */
 	private function location_to_configurator_placement( string $location ): string {
 		switch ( $location ) {
 			case 'cart':
@@ -70,6 +86,15 @@ class ConfigFactory {
 		}
 	}
 
+	/**
+	 * Returns the settings value or default, if does not exist or not allowed value.
+	 *
+	 * @param Settings   $settings The settings.
+	 * @param string     $key The key.
+	 * @param mixed      $default The default value.
+	 * @param array|null $allowed_values The list of allowed values, or null if all values are allowed.
+	 * @return mixed
+	 */
 	private function get_or_default( Settings $settings, string $key, $default, ?array $allowed_values = null ) {
 		if ( $settings->has( $key ) ) {
 			$value = $settings->get( $key );