This API returns a list of all custom fields you have configured in your company. You'll get information on the type of field, the name and description, and whether or not it is a compulsory field.
You won't get any details about the products the custom fields are associated with; for this you'll need to use the Get Product details API to find out which product uses which custom field.
The unique ID of the custom field in Billsby
The type of custom field, e.g. single line text, dropdown, checkboxes, etc.
The name of the custom field
The description of the custom field
The options available for some types of custom fields, i.e. dropdown, checkboxes
Is the field compulsory: