async createSmartAccount(signer: string) {
    if (!this.provider) {
      throw new Error('Provider not set');
    }

    const safe4337Pack = await Safe4337Pack.init({
      provider: this.provider as any,
      bundlerUrl,
      options: {
        owners: [signer],
        threshold: 1,
      },
      paymasterOptions: {
        paymasterUrl,
        isSponsored: true,
      },
    });

    // 2) Create SafeOperation
    const rawTx = {
      to: zeroAddress,
      data: '0x0000000000000000000000000000000000000000000000000000000000000000',
      value: '0',
    };

    const safeOperation = await safe4337Pack.createTransaction({
      transactions: [rawTx],
    });

    // 3) Sign SafeOperation
    const signedSafeOperation = await safe4337Pack.signSafeOperation(
      safeOperation,
    );

    // 4) Execute SafeOperation
    const userOperationHash = await safe4337Pack.executeTransaction({
      executable: signedSafeOperation,
    });
  }