Script Credentials
Overview
Credentials are not required when using the Script functionality in DataBlend, but a script can reference credentials that have been set up in the User’s group. These can be referenced in Script Collectors, Script Data Targets and Script Tasks.
The guid-of-credential can be found in the URL of the credential being referenced:

OAuth Redirect:
When creating a Script Credential and connecting to an API with OAuth 2.0 the system will request a URL to redirect the response to. Below are the redirect path.
(US) - https://ml.datablend.com/api/plugins/script/oauth/authorized
(UK) - https://ml.datablend.co.uk/api/plugins/script/oauth/authorized