# Extra fields

In addition to the fields that you create in the fields section, the module provides a number of other fields that you can use in your formula as well as in your php codes.

To access these extra fields, click the show more button in any formula panel

The fields will be displayed like this

The following is an explanation of each section

# PrestaShop fields

# product_price

The original product price without taxes and without reductions

This price may contain the current combination price impact

# product_weight

The original product weight including the selected combination weight impact

# quantity

The quantity selected by the customer

# Product attributes

This section will display the list of the attributes that are used by the current product combinations

The value of each field will contain the current value of the attribute that is selected by the customer.

The attribute names are prefixed by attribute_ and are transformed to lowercase and any accented characters or symbols are removed in order to comply with fields names rules.

# Databases

This section will be displayed if you have csv files in the databases data folder.
Check the Grid function documentation to learn more

# Features

Similar to the attribute names section, this section will display product features. The value of each field will contain the value of the corresponding product feature.

# Hidden fields

The module provides a field with the name changed which holds the name of the field that the customer changed in order to trigger the calculation

This field is also available in php, via the variable $changed