OptionalapiAccount API key — used for key-scoped operations when present.
OptionalapiAccount API secret — paired with apiKey.
OptionalapplicationVonage Application ID (UUID) — the JWT-auth identity for the Voice API.
OptionalprivateThe application's RSA private key (PEM) used to sign Voice-API JWTs.
The credentials object the
Vonageconstructor accepts (the subset we populate).