# 7.3 Contact Form 7 - Integration

Custom field values can now be updated through the Contact Form 7 form. To enable data updates, you’ll need to add a hidden field in the form. The hidden field is:

```
// Enable a form
[hidden lcw_form]
```

This hidden field activates data submission to the CRM. You also need to include the respective custom field keys and standard field keys in the form fields.

```
// for the basic fields
[text* firstName] // use the basic field key 
[text* lastName]
[email* email]

// for custom field
[text highest_steps_a_day] // get the key from {{ contact.highest_steps_a_day }}
```

Adding these fields will ensure data updates flow smoothly into the CRM.