Validation is a conditional expression is built around event parameters and sessions which helps you to perform different actions.
For example, shoppingEvent can have
amount spent as parameter. Then you can create a validation like
if amount > 100$. If the condition is true then you can send promotion coupon email to user.
Herogi gives you full power with enabling you to use multiple validations in same expression so you can create complicated rules for your business needs.
Validation creating is really simple. Just go scenarios page and select the scenario you want to add validation. You need select two parameters to apply validation function.