A list of variables are available in the journey which can be used to personalise and send advanced messages with the right context
Such variables can come from the following sources:
Trigger event. E.g. Ordered event would have variables like order value, order id, payment method and so on
Global variables. E.g. Customer name, store name and so on
External variables from call an external api or any other function call
Note: There are some readymade variable groups like order, product, cart where all sub-variables get populated by just passing order id, product id and customer id/phone respectively
