Creationg webhooks is only possible if the site runs on SSL which often on dev environments is not the case. In such context it doesn't make sense to even try creating webhooks.
This should be implemented in \Drupal\paypal_payment\Plugin\Payment\MethodConfiguration\PayPalExpress::updateWebhook
The same applies to localhost or any other site not being accessible, e.g. if basic auth is enabled.
Closed: outdated
1.0
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