Refactor app container to modularity.

lib/packages/Inpsyde/Modularity/Module/ExecutableModule.php

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+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module;
+
+use WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerInterface;
+
+interface ExecutableModule extends Module
+{
+
+    /**
+     * Perform actions with objects retrieved from the container. Usually, adding WordPress hooks.
+     * Return true to signal a success, false to signal a failure.
+     *
+     * @param ContainerInterface $container
+     *
+     * @return bool     true when successfully booted, otherwise false.
+     */
+    public function run(ContainerInterface $container): bool;
+}

lib/packages/Inpsyde/Modularity/Module/ExtendingModule.php

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+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module;
+
+interface ExtendingModule extends Module
+{
+
+    /**
+     * Return application services' extensions.
+     *
+     * Array keys will be services' IDs in the container, array values are callback that
+     * accepts as parameters the original service and a PSR-11 container and return an instance of
+     * the extended service.
+     *
+     * It is possible to explicitly extend extensions made by other modules.
+     * That is done by using as ID (array key in the `extensions` method) the target module ID
+     * and the service ID.
+     *
+     * @return array<string, callable(mixed $service, \WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerInterface $container):mixed>
+     */
+    public function extensions(): array;
+}

lib/packages/Inpsyde/Modularity/Module/FactoryModule.php

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+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module;
+
+interface FactoryModule extends Module
+{
+    /**
+     * Return application factories.
+     *
+     * Similar to `services`, but object created by given factories are not "cached", but a *new*
+     * instance is returned everytime `get()` is called in the container.
+     *
+     * @return array<string, callable(\WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerInterface $container):mixed>
+     */
+    public function factories(): array;
+}

lib/packages/Inpsyde/Modularity/Module/Module.php

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+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module;
+
+/**
+ * @package WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module
+ */
+interface Module
+{
+
+    /**
+     * Unique identifier for your Module.
+     *
+     * @return string
+     */
+    public function id(): string;
+
+}

lib/packages/Inpsyde/Modularity/Module/ModuleClassNameIdTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module;
+
+/**
+ * Trait ModuleClassNameIdTrait
+ *
+ * @package WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module
+ */
+trait ModuleClassNameIdTrait
+{
+
+    /**
+     * @return string
+     * @see Module::id()
+     */
+    public function id(): string
+    {
+        return __CLASS__;
+    }
+}

lib/packages/Inpsyde/Modularity/Module/ServiceModule.php

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+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Module;
+
+interface ServiceModule extends Module
+{
+
+    /**
+     * Return application services' factories.
+     *
+     * Array keys will be services' IDs in the container, array values are callback that
+     * accepts a PSR-11 container as parameter and return an instance of the service.
+     * Services are "cached", so the given factory is called once the first time `get()` is called
+     * in the container, and on subsequent `get()` the same instance is returned again and again.
+     *
+     * @return array<string, callable(\WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerInterface $container):mixed>
+     */
+    public function services(): array;
+}