Interface SpeechUsageMetrics

interface SpeechUsageMetrics {
    audioInputTokens?: number;
    audioOutputTokens?: number;
    billingUnits?: SpeechBillingUnits;
    cost?: string;
    costBreakdown?: SpeechCostLineItem[];
    costUSD?: number;
    durationSeconds?: number;
    estimated?: boolean;
    inputAudioSeconds?: number;
    inputCharacters?: number;
    inputTokens?: number;
    outputAudioSeconds?: number;
    outputCharacters?: number;
    outputTokens?: number;
}