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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In Kratos, is it possible to do a "mixed" registration flow where it posts to our backend and then our backend registers with Kratos and stores other info in our own data stores?

Hello <@U060NBK1WE8>
I think you are looking for the Ory Action webhooks: <https://www.ory.sh/docs/kratos/hooks/configure-hooks>

It needs to be in the same call "timing window"

so if that blocking webhook fails, does the registration fail too?