I am developing a Journey Builder Custom Activity, in one of the steps on Custom Activity UI, user needs to select a data extension then select a couple of fields. It looks like "UpdateContact" activity in Journey Builder. Does anyone know how to do this?
Welcome to the club of those who are trying to create custom activities and events for JB.
In this example you will see how to work with this library. Pay special attention to these files:
So you will get a point of how you can use SFMC data in your custom journey.
Probably, you will need to use the REST API resources in case you want to get Contact/Event data: