More explicit

Author: Prometee

docs/stripe-credentials.md

@@ -7,8 +7,16 @@ Get your `publishable_key` and your `secret_key` on your Stripe account :
 https://dashboard.stripe.com/test/apikeys
 
 ## Webhook key
-Then get a `webhook_secret_key` configured with at least two events : 
-`payment_intent.canceled` and `checkout.session.completed`
-and configured with the url to the URL to `notify.php` 
 
-https://dashboard.stripe.com/test/webhooks
+Then get a `webhook_secret_key` configured with at least two events :
+ 
+ - `payment_intent.canceled`
+ - `checkout.session.completed`
+
+The URL to fill is the url to your `notify.php`, here is an example :
+
+```
+http://localhost/notify.php?gateway=stripe_checkout_session
+```
+
+https://dashboard.stripe.com/test/webhooks