How to evaluate metadata in trigger?

Evaluate metadata from payment account

It is possible to use links in variables and filters on the trigger side. This way you can retrieve information from an account. Example :

{
    "event": "SAVED_PAYMENT",
    "workflowID": "xxx",
    "vars": {
    // We're going to retrieve the metadata foo of the account that is defined on the payments side.
        "myVar": "get(link(event, "destination_account").metadata, "foo")"
    }
}