PayPal

Log in via the PayPal Developer Dashboard.
Go to My apps & credentials, set Live, and click Create App to make a new PayPal app.
Copy the ClientID & Secret Key and add them into Settings > Payments in your admin panel.
Back in the PayPal dashboard, select your newly created app (under Live).
Scroll down to Production Webhooks and click Add Webhook.
For Webhook URL, use the endpoint from Admin > Settings > Payments.
After creating your webhook in the PayPal Developer Dashboard, copy the Webhook ID and add it to Admin > Settings > Payments > Processors > PayPal > PayPal Webhook ID. While this step is optional, adding the Webhook ID allows our system to securely verify and validate incoming PayPal webhook signatures.
Under Event types, select All Events and click Save.