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# How do I update from URL-based custom field parameters to template-based custom fields?

If you have previously used URL-based custom field parameters (in the format `customer_cf[n]`, where `n` is the numeric position of the customer custom field, for example `customer_cf[1]`, which denotes the first customer custom field) to pass data to Hosted Payment Pages, you can now remove those parameters and switch to the template-based approach for a seamless checkout experience and better data consistency, with values stored directly in Zoho Billing.

To switch from the old parameter based URLs to the new placeholder-based URLs, follow these steps:

Adding custom fields from [Hosted Payment Pages](/billing/help/settings/customisation/hosted-payment-pages.html#customfields) is in early access for existing organizations and is enabled by default for organizations created after July 2026. To get it enabled for your organization, [contact our support team](mailto:support@zohobilling.com).

*   Remove the old `customer_cf[n]` parameters from your Hosted Payment Page URLs.
    
*   Go to **Settings** > **Hosted Payment Pages** and edit your template.
    
    *   Open the **Order Details** tab.
    *   Under **Account Information**, click **Add Field** under **Customer Custom Fields** to add customer custom fields.
    *   Under **Additional Information** (Single-Page) or **Final Summary** (Multi-Page), click **Add Field** under **Invoice Custom Fields** to add invoice custom fields.
    *   Choose the field type and click **Save**.
*   Get the _API Field Name_ for each custom field from **Settings** > **Preferences** > **Customers** or **Invoices** > **Field Customization**.
    
*   Use the API field names as parameters in your plan URLs to prefill values (for example, `?cf_customer_segment=Enterprise`).
    
*   Test the updated links with sample data and verify that values are saved correctly in Zoho Billing.
    

For step-by-step instructions and placeholders, refer to [Prefill Customer and Invoice Custom Fields Using API Field Names](/billing/help/settings/customisation/pre-fill.html#prefill-customer-custom-fields-api).