After you created one or more custom fields, you can map them to checkout fields to populate them from your online store's checkout.
When your customers place a reservation, you may want to know some personal details or general information about the rental order.
The information you collect in the checkout of your Online Store is automatically mapped to Orders and Customers.
To add custom checkout fields
First, make sure you created at least one custom field for orders or customers.
Go to Settings > Online Checkout.
In the Checkout fields section, click Add field.
Give your field a name.
The name you use in the checkout can be different than the name you use internally ("Where did you hear about us" for a referral field, for example).
Select the custom field that will store the data.
You can add fields for a rental order or a customer.
Optionally, choose if filling in the field is required to complete the checkout.
Now, information that customers fill out in your checkout is automatically mapped to the corresponding custom field.