Hiding Fields on the Booking form

When you add a Custom field to your Booking form, the field is visible by default. You can choose to hide the field, so that it will not be displayed on the Booking form.

In this article, you'll learn about hiding fields on the Booking form.

Why hide fields on the Booking form?

Hiding fields is typically done to pass internal company information through the booking process, without exposing it to the Customer. 

For example, you might have an ID for a particular marketing source that you need to track with the booking information. The ID is internal and Customers shouldn't see it when they book. With hidden fields, you can include the ID in the URL parameters and pass it to a third party CRM integration, add it to a calendar event or include it in User notifications.

Customers are not able to input a value for hidden fields and they can't be made mandatory fields. To use a hidden field, you should provide a value with URL parameters

Hidden fields should not be used to pass sensitive information because the data is still visible and editable in the Booking page URL.

Important Data from hidden fields will be added to the default calendar event in the Users connected calendar. If the Customer is included as a guest on the calendar event they will see the hidden field data in the event details. 

To prevent this you can remove the Customer from the calendar event or you can create a custom event template.

Creating a hidden Custom field

  1. Go to Setup and open the left sidebar. 
  2. Select Tools -> Booking forms editor
  3. Click the Add Custom field to library button.
  4. Select Single line text field as the Field type (Figure 1).
    Figure 1: Creating a hidden Custom field
  5. At the bottom of the field editor, select the Do not display this field to Customers checkbox. 
  6. Click Save.

To use a hidden Custom field, add it to your booking form

NoteHidden fields do not show in the Booking form previews.


If you wish to pass a marketing campaign ID in the URL and pass it to a Custom field in your CRM. You should follow these steps:

  1. Create a hidden Custom field for the marketing campaign ID and add it to your Booking form.
  2. In the CRM integration setup, map the hidden ScheduleOnce field to the Custom field in your CRM.
  3. In the marketing campaign add the link to your Booking page with the marketing campaign ID in the URL. For example, go.oncehub.com/example?marketing-campaign-ID=1234

When a booking is made using this link, the marketing campaign ID (1234) will be mapped to the Customer record in your CRM.

Note If you are using UTM codes, you can enable source tracking to pass UTM tags that you have added to your personalized links. The following five source tracking field names are reserved for source tracking, and cannot be used as Custom field names:

  • utm_source = used for identifying the traffic source
  • utm_medium = used for identifying the delivery method
  • utm_campaign = used for keeping track of different campaigns
  • utm_term = used for identifying keywords
  • utm_content = used for split testing or separating two ads that go to the same URL
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