fix: scope PaymentManagement DI to frontend/webapi_rest to prevent EE admin crash

The PaymentManagementInterface preference was registered in the global
etc/di.xml, making its implementation (PaymentManagement) resolvable in
all areas including admin. PaymentManagement depends on
Magento\Checkout\Model\Session — a frontend-only session class that
cannot be properly instantiated in the admin area.

On Adobe Commerce EE 2.4.8, the admin "Create New Order" page triggers
resolution of this dependency chain, causing a PHP exception that
crashes the entire page (6 MFTF test failures).

Changes:
- Move PaymentManagementInterface preference from global di.xml to
  etc/frontend/di.xml and etc/webapi_rest/di.xml
- Inject Checkout\Session via Proxy to defer instantiation until
  actually needed (defense in depth)
- Bump version to 3.0.5

Author: jules-paystack

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "pstk/paystack-magento2-module",
     "description": "Paystack Magento2 Module using \\Magento\\Payment\\Model\\Method\\AbstractMethod",
-    "version": "3.0.4",
+    "version": "3.0.5",
     "require": {},
     "type": "magento2-module",
     "license": [

etc/di.xml

@@ -1,8 +1,4 @@
 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
-    
-    <!-- API -->
-    <preference for="Pstk\Paystack\Api\PaymentManagementInterface" type="Pstk\Paystack\Model\PaymentManagement"/>
-
 
 </config>

etc/frontend/di.xml

@@ -1,5 +1,13 @@
 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <!-- Payment verify API (frontend + webapi_rest only — never in admin) -->
+    <preference for="Pstk\Paystack\Api\PaymentManagementInterface" type="Pstk\Paystack\Model\PaymentManagement"/>
+    <type name="Pstk\Paystack\Model\PaymentManagement">
+        <arguments>
+            <argument name="checkoutSession" xsi:type="object">Magento\Checkout\Model\Session\Proxy</argument>
+        </arguments>
+    </type>
+
     <type name="Magento\Checkout\Model\CompositeConfigProvider">
         <arguments>
             <argument name="configProviders" xsi:type="array">
@@ -11,7 +19,7 @@
         <plugin name="csrf_validator_skip" type="Pstk\Paystack\Plugin\CsrfValidatorSkip" />
     </type>
 
-    <!-- CSP: register Paystack domains via PHP collector (frontend only - Paystack is not used in admin) -->
+    <!-- CSP: register Paystack domains via PHP collector (frontend only — Paystack is not used in admin) -->
     <type name="Magento\Csp\Model\CompositePolicyCollector">
         <arguments>
             <argument name="collectors" xsi:type="array">

etc/module.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
-    <module name="Pstk_Paystack" setup_version="3.0.4">
+    <module name="Pstk_Paystack" setup_version="3.0.5">
         <sequence>
             <module name="Magento_Sales"/>
             <module name="Magento_Payment"/>

etc/webapi_rest/di.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <!-- Payment verify API for REST calls -->
+    <preference for="Pstk\Paystack\Api\PaymentManagementInterface" type="Pstk\Paystack\Model\PaymentManagement"/>
+    <type name="Pstk\Paystack\Model\PaymentManagement">
+        <arguments>
+            <argument name="checkoutSession" xsi:type="object">Magento\Checkout\Model\Session\Proxy</argument>
+        </arguments>
+    </type>
+</config>