[wp-trac] [WordPress Trac] #65369: Connectors API: add OAuth authentication method support

[WordPress Trac]

#65369: Connectors API: add OAuth authentication method support
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 Reporter:  extrachill      |      Owner:  (none)
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Administration  |    Version:
 Severity:  normal          |   Keywords:  needs-design
  Focuses:  administration  |
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 The Connectors API should support native OAuth flows. This would unlock a
 lot of capability especially in the AI era.

 **Current State:**

 - Core currently only accepts authentication.method values api_key and
 none in src/wp-includes/class-wp-connector-registry.php.
 - There is an explicit PHPUnit test that rejects oauth as invalid.
 - The admin UI only renders a built-in card for api_key connectors.
 - The WP AI Client bundled in core only has ApiKeyRequestAuthentication;
 its auth enum says “At the moment, this is the only supported method.”

 **OAuth Flows in WordPress Would Unlock:**

 1. Social media connectors
 2. Chat app connectors (WhatsApp, Telegram, Slack)
 3. Analytics app connectors (GA4, GSC, etc)
 4. GitHub, Codex, etc connectors


 I genuinely believe this should happen as soon as possible. Thank you!

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Ticket URL: <https://core.trac.wordpress.org/ticket/65369>
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