Problem with your Stripe webhook

I have copied and pasted the webhook into Stripe, but I am getting the below issue. What am I missing?

I got the webhook from invoicing > settings > Payment Gateways > Stripe.
https://www.babababoon.co.uk/index.php?wpi-listener=IPN&wpi-gateway=stripe

And I have pasted it into Stripe at https://dashboard.stripe.com/account/webhooks

Hi there,

We’re contacting you because the webhook endpoint associated with your babababoon.co.uk account in live mode has been failing for five consecutive days. Webhooks are used to notify your server about events that happen in your Stripe account, such as a payout completing or an invoice being created. The failing webhook endpoint is https://www.babababoon.co.uk/index.php?wpi-listener=IPN&wpi-gateway=stripe.

We have disabled your webhook endpoint so it will no longer receive these events from Stripe. If you’d like to re-enable your endpoint once you’ve fixed the problem, you can do so by clicking the ‘Enable’ button for the webhook in your Stripe settings: https://dashboard.stripe.com/account/webhooks.

One recent call to your endpoint returned an HTTP status code 403, However, our webhook systems only treats a webhook as successful if we get back a status code between 200 and 299. You can view the event for this failed notification here: https://dashboard.stripe.com/events/evt_1C8kqmEXYjjQLyBIAHVBQIiU. To acknowledge receipt of a webhook, your endpoint should return a 2xx HTTP status code.

For more in depth information about how to use webhooks, we recommend taking a look at our documentation: https://stripe.com/docs/webhooks.

Yours,

The Stripe team