Stripe

Log in to your Stripe Dashboard.
From the sidebar, go to Developers > API Keys.
Copy the Publishable key and Secret key and paste them into Admin > Settings > Payments > Processors > Stripe.
Next, open Webhooks and click Add endpoint.
For the Endpoint URL, use the webhook endpoint from Admin > Settings > Payments > Processors > Stripe.
Select the Version (latest) and choose Select all events under events to listen to.
Once created, Stripe provides a Webhook secret. Copy that into Admin > Settings > Payments > Stripe Webhooks Secret.