generateSignature(payload: string, secret: string): string {
    const computedSignature = crypto
      .createHmac('sha256', secret)
      .update(payload)
      .digest('hex');
    return computedSignature;
  }

generateSignature(payload: string, secret: string): string {
    const computedSignature = crypto
      .createHmac('sha256', secret)
      .update(payload)
      .digest('hex');
    return computedSignature;
  }