Add subscription pause support to Commerce Stripe

Plugin.php

<?php

namespace modules;

use Craft;
use craft\commerce\elements\Subscription;
use DateTime;
use Twig\Error\LoaderError;
use Twig\Error\SyntaxError;
use yii\base\Module;

/**
 * Class PauseSubscription
 *
 * @author  Ether Creative
 * @package modules
 */
class PauseSubscription extends Module 
{
	
	public function init ()
	{
		parent::init();
		
		Craft::$app->getView()->hook(
			'cp.commerce.subscriptions.edit.content',
			[$this, 'hookCpCommerceSubscriptionsContentEdit']
		);
	}
	
	/**
	 * @param array $context
	 *
	 * @return string
	 * @throws LoaderError
	 * @throws SyntaxError
	 */
	public function hookCpCommerceSubscriptionsContentEdit (array &$context)
	{
		$view = Craft::$app->getView();

		$css = <<<CSS
.b-badge {
	padding: 2px 6px;
	font-size: 11px;
	text-transform: uppercase;
	line-height: 16px;
	border-radius: 8px;
	background-color: #596673;
	color: #fff;
}
CSS;
		$view->registerCss($css);

		/** @var Subscription $subscription */
		$subscription = $context['subscription'];

		if ($subscription->isCanceled || $subscription->isExpired)
			return '';

		$paused = $subscription->getSubscriptionData()['pause_collection'];
		$context['isPaused'] = !empty($paused);
		$context['pausedUntil'] = null;

		if ($context['isPaused'] && !empty($paused['resumes_at']))
			$context['pausedUntil'] = (new DateTime())->setTimestamp($paused['resumes_at']);

		$markup = <<<TWIG
<div class="pane">
	<h2>Pause Subscription <span class="b-badge">Custom</span></h2>
	<form method="POST">
        <input type="hidden" name="action" value="pause-subscription/subscriptions/{{ isPaused ? 'resume' : 'pause' }}">
        <input type="hidden" name="subscriptionUid" value="{{ subscription.uid|hash }}">
        {{ redirectInput(continueEditingUrl) }}
        {{ csrfInput() }}

        <div class="field">
            <div class="btngrp">
                <input type="submit" class="btn submit" value="{{ isPaused ? 'Resume' : 'Pause' }}">
                {% if isPaused %}
                    {% if pausedUntil %}
                        <strong>&nbsp;Paused until: {{ pausedUntil|date }}</strong>
                    {% else %}
                        <strong>&nbsp;Paused indefinitely</strong>
                   {% endif %}
                {% else %}
                    for
                    <input class="text" type="text" name="for" placeholder="1 month" />
                {% endif %}
            </div>
        </div>
    </form>
</div>
TWIG;

		return $view->renderString($markup, $context);
	}
	
}

SubscriptionsController.php

<?php

namespace modules\controllers;

use Craft;
use craft\commerce\elements\Subscription;
use craft\commerce\Plugin as Commerce;
use craft\commerce\stripe\gateways\PaymentIntents;
use craft\commerce\stripe\Plugin as StripePlugin;
use craft\web\Controller;
use DateTime;
use Exception;
use Stripe\Stripe;
use yii\base\InvalidConfigException;

/**
 * Class SubscriptionController
 *
 * @author  Ether Creative
 * @package modules\controllers
 */
class SubscriptionsController extends Controller
{

	public function __construct ($id, $module, $config = [])
	{
		parent::__construct($id, $module, $config);

		Stripe::setApiKey(Craft::parseEnv(Commerce::getInstance()->getGateways()->getGatewayByHandle('CHANGE_ME')->apiKey));
		Stripe::setAppInfo(StripePlugin::getInstance()->name, StripePlugin::getInstance()->version, StripePlugin::getInstance()->documentationUrl);
		Stripe::setApiVersion(PaymentIntents::STRIPE_API_VERSION);
	}

	public function actionPause ()
	{
		$request = Craft::$app->getRequest();
		$session = Craft::$app->getSession();

		$uid = $request->getValidatedBodyParam('subscriptionUid');
		$for = $request->getBodyParam('for');
		$sub = Subscription::find()->anyStatus()->uid($uid)->one();
		$data = $sub->getSubscriptionData();

		$resumesAt = null;

		if (!empty($for))
		{
			$d = new DateTime();

			try {
				$d = $d->modify($for);
			} catch (Exception $e) {
				$d = false;
				Craft::error($e, 'B:SubscriptionPause');
			}

			if ($d === false)
			{
				$session->setError('Pause duration is invalid (see logs)!');
				return $this->redirectToPostedUrl();
			}

			if ($d <= new DateTime())
			{
				$session->setError('Pause duration must result in the future!');
				return $this->redirectToPostedUrl();
			}

			$resumesAt = $d->getTimestamp();
		}

		\Stripe\Subscription::update($data['id'], [
			'pause_collection' => [
				'behavior' => 'void',
				'resumes_at' => $resumesAt,
			],
		]);

		self::_refresh($sub);

		return $this->redirectToPostedUrl();
	}

	public function actionResume ()
	{
		$uid = Craft::$app->getRequest()->getValidatedBodyParam('subscriptionUid');
		$sub = Subscription::find()->anyStatus()->uid($uid)->one();
		$data = $sub->getSubscriptionData();

		\Stripe\Subscription::update($data['id'], [
			'pause_collection' => '',
		]);

		self::_refresh($sub);

		return $this->redirectToPostedUrl();
	}

	/**
	 * Refresh the subscription data
	 * (Bit of a hack, kinda shitty that we can't do it directly. You can remove
	 *  this if you're only viewing the subscription in the CP)
	 *
	 * @param Subscription $subscription
	 *
	 * @throws InvalidConfigException
	 */
	private static function _refresh (Subscription $subscription)
	{
		$subscription->getGateway()->getHasBillingIssues($subscription);
	}

}