@cfxlabsinc/b2b-services
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    type SessionCookieKeys = {
        audience: SessionCookieAudience;
        keys: ReadonlyMap<string, Uint8Array>;
        signingKid: string;
    }
    Index
    keys: ReadonlyMap<string, Uint8Array>

    HMAC keys by kid: the current secret's, and the previous one's to verify only.

    signingKid: string

    The kid new cookies are signed under: the current secret's.