Use Emails as Custom Activities in SFMC
When I saw Journey Builder Custom Activities for the first time, I asked “Can I build it only with Marketing Cloud?”. The simple answer was “No.”. You cannot build a whole custom activity just in Marketing Cloud. At least as long as you think about the standard way using the installed package, JWT, config.json and so on. You find a short explanation why you need an external web server in this thread on stackoverflow. As the title suggests I want…