diff --git a/modules/ppcp-api-client/src/Authentication/ClientCredentials.php b/modules/ppcp-api-client/src/Authentication/ClientCredentials.php
index 7ec4628a5..08d37bead 100644
--- a/modules/ppcp-api-client/src/Authentication/ClientCredentials.php
+++ b/modules/ppcp-api-client/src/Authentication/ClientCredentials.php
@@ -10,6 +10,7 @@ declare(strict_types=1);
 namespace WooCommerce\PayPalCommerce\ApiClient\Authentication;
 
 use WooCommerce\PayPalCommerce\WcGateway\Settings\Settings;
+use WooCommerce\PayPalCommerce\WcGateway\Exception\NotFoundException;
 
 /**
  * Class ClientCredentials
@@ -28,14 +29,21 @@ class ClientCredentials {
 	 *
 	 * @param Settings $settings The settings.
 	 */
-	public function __construct(Settings $settings) {
+	public function __construct( Settings $settings ) {
 		$this->settings = $settings;
 	}
 
+	/**
+	 * Returns encoded client credentials.
+	 *
+	 * @return string
+	 * @throws NotFoundException If setting does not found.
+	 */
 	public function credentials(): string {
-		$client_id = $this->settings->has( 'client_id' ) ? $this->settings->get( 'client_id' ) : '';
+		$client_id     = $this->settings->has( 'client_id' ) ? $this->settings->get( 'client_id' ) : '';
 		$client_secret = $this->settings->has( 'client_secret' ) ? $this->settings->get( 'client_secret' ) : '';
 
-		return 'Basic ' . base64_encode($client_id . ':' . $client_secret);
+		// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
+		return 'Basic ' . base64_encode( $client_id . ':' . $client_secret );
 	}
 }