@cfxlabsinc/b2b-services
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    One app client's half of the round trip, its signer keyed from its own secret.

    type OAuthClient = {
        client: Pick<CognitoAuthClient, "authorizeUrl" | "exchangeCode">;
        signer: CookieSigner;
    }
    Index
    client: Pick<CognitoAuthClient, "authorizeUrl" | "exchangeCode">
    signer: CookieSigner