However, there is no predefined condition to exclude a group of users from the campaign. For example, you have a custom attribute called Debt, with two possible values set: true or false. Let it be that you want to set a campaign for all users, but not for those who are in debt with your app. The best way to do so is to create a condition using an expression.
How to do it? To include a customer with a specific custom value, you would use an expression that looks like this:
To exclude those users, you have to set the opposite of it, which you can accomplish by adding “!” at the beginning of it: