# Create a New Apex Class

In this task, Felix needs to create a new Apex class to inject logic for the new custom field – Billing Zip Code. Without this logic the new custom field will not populate.

1. Navigate to the **Setup** icon and select **Developer Console**.

2. From the **Developer Console**, click **File > New > Apex Class**.

3. Name the Apex Class `CpqAppHandlerHookImplementation` and click **OK**.

4. Click [here](https://volt.my.salesforce.com/sfc/p/o0000000IKm8/a/3m0000005upo/e5fxAdKe2n4qwyxNK2u8\_0.32vNJ9pPUWfbdVrHGfEc) to download the `CpqAppHandlerHookImplementation.txt` file.

5. Paste the code from that file in the **Enter Apex Code** box. You will have 48 lines of code.

   ![](https://a.sfdcstatic.com/developer-website/sfdocs/industries/media/image90.png)

6. Click **File > Save**.

7. Review line 12. Note the `String customFields` API.

8. Close the Developer Console.

See [Create the CpqAppHandlerHook Implementation](/docs/industries/cme/guide/comms-create-the-cpqapphandlerhook-implementation.md).