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Can Oathkeeper support multiple authenticators of the same type? For instance, if I had two separate OAuth providers, would I be able to specify two handlers of type `oauth_introspections`?

you could use oath_introspection twice, however, you would have to provide the token in two different places, once ory matches a given authenticator (meaning, as an example, it finds the header an authenticator is looking for), it will only try that authenticator

even if that authenticator fails, it will not try any others and will immediately fail the request

so you could use `token_from: header: Authorization-Provider1` and another with `token_from: header: Authorization-Provider2` and it should work