As you create these personas, understand that you can never know your customer too well. Once you have a true and very vivid idea of your targets, you can apply that to product creation, marketing ...

This is where you will create your webhook entries and get the authentication tokens that your script will need to send messages into the server.

These days, nearly all businesses are of the "digital-first" variety. That said, it's still very much possible to deliver personalized experiences to customers.