could someone tell me where the webhook migration script is?
There should be a Migrate Webhooks to v6 tab under ServiceNow’s PagerDuty menu.
To re-run this option, you can run the script by going to System Definition > Application Menu > PagerDuty > turn MIGRATE WEBHOOKS to v6.0 to True. Update the page, then refresh the ServiceNow UI. You should see it re-appear in the navigation bar now.
Modifications to this out of the box feature can be found under the Configuration Files > Script Includes > PagerDutyMigration.