Update version and release notes

Author: BushraAsif

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.5.8] - 2026-02-23
+### Added
+- Add support for `checkoutSession` API method.
+
 ## [3.5.7] - 2025-11-24
 ### Added
 - Add option to use `transaction_info` for `captureReservation`, `refundCapturedReservation` and `updateOrder/{id}/reconciliationIdentifier`.

src/AbstractApi.php

@@ -55,7 +55,7 @@ abstract class AbstractApi
     /**
      * PHP API version
      */
-    const PHP_API_VERSION = '3.5.7';
+    const PHP_API_VERSION = '3.5.8';
 
     /**
      * Event dispatcher