A LinkedIn Marketing API token that can post to your profile or company page.
LinkedIn has two posting paths: w_member_social (post as yourself) and w_organization_social (post as a Company Page). The second needs your App linked to a Page you admin. Tokens last 60 days and are refreshable.
LinkedIn's developer portal is a separate universe from the main site. You'll register an App that represents your integration — it holds your Client ID, Client Secret, and the scopes you've been approved for.
Create app
linkedin.com/developers/apps → Create App. Name it whatever makes sense. LinkedIn Page: pick any Page you admin (it becomes the owner of the App). Upload an icon. Accept the terms. Save.
Next: register http://localhost:8765/callback as a redirect URI in the Auth tab, run the bootstrap script for OAuth 2.0, swap the code for an access token (60 days), save the refresh token. ~8 more clicks.