Start a passkey login (challenge and allowed credentials)
POST
/sessions/passkey/optionsHeaders
Idempotency-KeystringOptionalSend on every write that creates or changes money or state; a replay with the same key returns the original result with 200.
Body parameters
emailstringOptionalReturns
200 OK
Errors
Every error is a problem document with a stable code. See Errors.
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