export interface SecureWebhookVerifyOptions {
    timeout?: number;
    timestamp?: number;
}
export interface SecureWebhooks {
    sign(input: string, secret: string, timestamp?: number): Promise<string>;
    verify(input: string, secret: string, signature: string, opts?: SecureWebhookVerifyOptions): Promise<boolean>;
}
export declare const symmetric: SecureWebhooks;
/**
 * Verify a Retell webhook signature against the exact raw request body.
 */
export declare const verify: (body: string, apiKey: string, signature: string) => Promise<boolean>;
/**
 * Sign a webhook body using the Retell webhook signature format.
 */
export declare const sign: (body: string, apiKey: string) => Promise<string>;
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