diff --git a/README.md b/README.md
index 84cf113..2986717 100644
--- a/README.md
+++ b/README.md
@@ -185,7 +185,12 @@ The Stripe plugin handles this relationship using [nested elements](https://craf
       {{ price.data|unitAmount }}
       {{ tag('a', {
         text: "Buy now",
-        href: price.getCheckoutUrl(),
+        href: price.getCheckoutUrl(
+          currentUser ?? false,
+          'shop/thank-you?session={CHECKOUT_SESSION_ID}',
+          product.url,
+          {}
+        ),
       }) }}
     </li>
   {% endfor %}
@@ -198,20 +203,20 @@ When a customer is ready to buy a product or start a subscription, you’ll prov
 
 Clicking a checkout link takes the customer to Stripe’s hosted checkout page, where they can complete a payment using whatever methods are available and enabled in your account.
 
-To output a checkout link, use the `craft.stripeCheckoutUrl()` function:
+To output a checkout link, use the `stripeCheckoutUrl()` function:
 
 ```twig
 {% set price = product.prices.one() %}
 
 {{ tag('a', {
-  href: craft.stripe.checkout.getCheckoutUrl(
+  href: stripeCheckoutUrl(
     [
       {
         price: price.stripeId,
         quantity: 1,
       },
     ],
-    null,
+    currentUser ?? false,
     'shop/thank-you?session={CHECKOUT_SESSION_ID}',
     product.url,
     {}
@@ -220,6 +225,9 @@ To output a checkout link, use the `craft.stripeCheckoutUrl()` function:
 }) }}
 ```
 
+> [!TIP]
+> Passing `false` as the second parameter to the `stripeCheckoutUrl()` allows you to create an anonymous checkout URL.
+
 ### Checkout Form
 
 As an alternative to generating static Checkout links, you can build a [form](https://craftcms.com/docs/5.x/development/forms.html) that sends a list of items and other params to Craft, which will create a checkout session on-the-fly, then redirect the customer to the Stripe-hosted checkout page:
@@ -232,6 +240,9 @@ As an alternative to generating static Checkout links, you can build a [form](ht
   {{ actionInput('stripe/checkout') }}
   {{ hiddenInput('successUrl', 'shop/thank-you?session={CHECKOUT_SESSION_ID}'|hash) }}
   {{ hiddenInput('cancelUrl', 'shop'|hash) }}
+  {% if not currentUser %}
+    {{ hiddenInput('customer', 'false') }}
+  {% endif %}
 
   <select name="lineItems[0][price]">
     {% for price in prices %}
@@ -245,6 +256,12 @@ As an alternative to generating static Checkout links, you can build a [form](ht
 </form>
 ```
 
+> [!TIP]
+> By default, the currently logged-in user will be used.
+> 
+> To allow an anonymous checkout, you can add `{{ hiddenInput('customer', 'false') }}` to the form.
+
+
 ### Billing Portal
 
 Customers can manage their subscriptions and payment methods via Stripe’s hosted [billing portal](https://docs.stripe.com/customer-management). You can generate a URL to a customer’s billing portal using the `currentUser.getStripeBillingPortalSessionUrl()` method:
@@ -416,7 +433,7 @@ You can set `$event->isValid` to prevent updates from being persisted during the
 
 ### Checkout Events
 
-Customize the parameters sent to Stripe when generating a Checkout session by listening to the `craft\stripe\services\Checkout::EVENT_BEFORE_START_CHECKOUT_SESSION` event. The `craft\stripe\events\CheckoutSessionEvent` will have a `sessionData` property containing the request data that is about to be sent with the Stripe API client. You may modify or extend this data to suit your application—whatever the value of the property is after all handlers have been invoked is passed verbatim to the API client:
+Customize the parameters sent to Stripe when generating a Checkout session by listening to the `craft\stripe\services\Checkout::EVENT_BEFORE_START_CHECKOUT_SESSION` event. The `craft\stripe\events\CheckoutSessionEvent` will have a `params` property containing the request data that is about to be sent with the Stripe API client. You may modify or extend this data to suit your application—whatever the value of the property is after all handlers have been invoked is passed verbatim to the API client:
 
 ```php
 craft\base\Event::on(
@@ -433,11 +450,11 @@ craft\base\Event::on(
 
         if ($currentUser->isInGroup('members')) {
             // Memoize + assign values:
-            $data = $event->sourceData;
+            $data = $event->params;
             $data['metadata']['is_member'] = true;
 
             // Set back onto the event:
-            $event->sourceData = $data;
+            $event->params = $data;
         }
     },
 );
diff --git a/src/controllers/CheckoutController.php b/src/controllers/CheckoutController.php
index 5ae148e..6944281 100644
--- a/src/controllers/CheckoutController.php
+++ b/src/controllers/CheckoutController.php
@@ -22,6 +22,8 @@
  */
 class CheckoutController extends Controller
 {
+    protected array|bool|int $allowAnonymous = true;
+
     /**
      * @inheritdoc
      */
@@ -40,8 +42,6 @@ public function actionCheckout(): Response
 
         $request = Craft::$app->getRequest();
 
-        $currentUser = Craft::$app->getUser()->getIdentity();
-
         // process line items
         $postLineItems = $request->getRequiredBodyParam('lineItems');
         $lineItems = collect($postLineItems)->filter(fn($item) => $item['quantity'] > 0)->all();
@@ -52,9 +52,16 @@ public function actionCheckout(): Response
 
         $successUrl = $request->getValidatedBodyParam('successUrl');
         $cancelUrl = $request->getValidatedBodyParam('cancelUrl');
+        $customer = $request->getBodyParam('customer');
+
+        if ($customer == 'false' || $customer == '0' || $customer === false || $customer === 0) {
+            // if customer was explicitly set to something falsy,
+            // go with false to prevent trying to find the currently logged in user further down the line
+            $customer = false;
+        }
 
         // start checkout session
-        $url = Plugin::getInstance()->getCheckout()->getCheckoutUrl($lineItems, $currentUser, $successUrl, $cancelUrl);
+        $url = Plugin::getInstance()->getCheckout()->getCheckoutUrl($lineItems, $customer, $successUrl, $cancelUrl);
 
         return $this->redirect($url);
     }
diff --git a/src/elements/Price.php b/src/elements/Price.php
index c548510..6faf4e8 100644
--- a/src/elements/Price.php
+++ b/src/elements/Price.php
@@ -606,12 +606,20 @@ public function getProduct(): Product|null
     /**
      * Shortcut to get the checkout URL for the price element.
      *
+     * @param string|User|false|null $customer,
+     * @param string|null $successUrl,
+     * @param string|null $cancelUrl,
+     * @param array|null $params,
      * @return string
      * @throws InvalidConfigException
      * @throws \Throwable
      */
-    public function getCheckoutUrl(): string
-    {
+    public function getCheckoutUrl(
+        string|User|false|null $customer = null,
+        ?string $successUrl = null,
+        ?string $cancelUrl = null,
+        ?array $params = null,
+    ): string {
         return Plugin::getInstance()->getCheckout()->getCheckoutUrl(
             [
                 [
@@ -619,7 +627,10 @@ public function getCheckoutUrl(): string
                     'quantity' => 1,
                 ],
             ],
-            Craft::$app->getUser()->getIdentity(),
+            $customer,
+            $successUrl,
+            $cancelUrl,
+            $params
         );
     }
 }
diff --git a/src/services/Checkout.php b/src/services/Checkout.php
index a6e7824..0936c36 100644
--- a/src/services/Checkout.php
+++ b/src/services/Checkout.php
@@ -37,14 +37,15 @@ class Checkout extends Component
      * Returns checkout URL based on the provided email.
      *
      * @param array $lineItems
-     * @param string|User|null $user User Element or email address
+     * @param string|User|false|null $user User Element or email address
      * @param string|null $successUrl
      * @param string|null $cancelUrl
+     * @param array|null $params
      * @return string
      */
     public function getCheckoutUrl(
         array $lineItems = [],
-        string|User|null $user = null,
+        string|User|false|null $user = null,
         ?string $successUrl = null,
         ?string $cancelUrl = null,
         ?array $params = null,
@@ -151,7 +152,7 @@ private function startCheckoutSession(
 
         if ($customer instanceof Customer) {
             $data['customer'] = $customer->stripeId;
-        } else {
+        } elseif (is_string($customer)) {
             $data['customer_email'] = $customer;
         }
 
diff --git a/src/web/twig/Extension.php b/src/web/twig/Extension.php
index 9cd1624..d8f54bd 100644
--- a/src/web/twig/Extension.php
+++ b/src/web/twig/Extension.php
@@ -7,6 +7,7 @@
 
 namespace craft\stripe\web\twig;
 
+use craft\elements\User;
 use craft\stripe\helpers\Price;
 use craft\stripe\Plugin;
 use Twig\Extension\AbstractExtension;
@@ -46,7 +47,7 @@ public function getFunctions()
         return [
             new TwigFunction('stripeCheckoutUrl', function(
                 array $lineItems = [],
-                ?string $customer = null,
+                string|User|false|null $customer = null,
                 ?string $successUrl = null,
                 ?string $cancelUrl = null,
                 ?array $params = null,