/**
 * Verifies a webhook payload signature.
 *
 * @param payload - The raw request body as a string or Buffer.
 * @param signature - The signature from the webhook request header.
 * @param secret - The shared secret used to verify the signature.
 * @returns The verified payload.
 * @throws {@link ConnectError} with code `WEBHOOK_INVALID` — this function is not yet implemented.
 */
export declare function verifyWebhook(payload: string | Buffer, signature: string, secret: string): unknown;
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