> For the complete documentation index, see [llms.txt](https://developer.firmhouse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.firmhouse.com/liquid/using-extra-fields-in-liquid.md).

# Using Extra Fields in Liquid

You can optionally collect additional details from your customers by creating Extra Fields in Checkout settings. For example you can create a birthday field, which you can then use in Liquid as `{{extra_field.birthday}}`.

### How it works

If you add an "Extra Field" field, "Pet name" for example, it can be translated to `{{extra_field.pet_name}}`. This feature can be accessed on the Firmhouse portal via the "Checkout" menu > "Extra fields and Validations" submenu on the left. Here you can Create, Edit and Delete an extra field.