Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Is there a place to see what oauth grants Hydra support? I only see Authorization Code and Client Credentials? Is PKCE not supported?

PKCE is supported, but it isn't a grant type
<https://www.ory.sh/docs/hydra/guides/oauth2-public-spa-mobile#creating-a-public-oauth-20-client>