In tealeaf you can configure an event to populate a UBX event. The UBX events and attributes are pre-defined and cannot be changed. For example, for the "viewed product" event you can pass information like product id, name, category etc, but this list of attributes is limited to the fields provided. It would be great if each event had a "custom" attribute into which you could pass whatever you wanted. You could then use this to pass a string of name:value pairs to fulfil any additional attribute requirements that aren't met by the predefined list.