Make sure you're in "Live environment"
Under the “Live API credentials” in the “LIVE Webhooks” sections click “Add Webhook”
Copy the below url in the “Webhook URL”
In Paypal In the Header under the “webhook Url” paste the content from above step
In the “Event type” radiogroup search and check “Checkout Order approved”
Click Save in the bottom of the event list:
One more thing you need to check, in the last section “Live App Settings”:
Check “Accepts payments” which allows you to receive funds.
The remaining options are optional but it can help you in the future, especially “Customer disputes” which will allow refunding your users.