These days, a lot of people use the WhatsApp mobile phone app. Kindly send the user a WhatsApp message as well. in order for the user to determine the success or failure of his FME workflow. For example, we now have an emailer transformer.
There’s various API’s that can be used to send Whatsapp messages, i used CallMeBot (but that only allows you to send messages to yourself on the free tier if I understand correctly)