hi, i have a doubt about how to use

context.UserEventType.PAYBILLS

I understand this corresponds to when a user is in the PAY BILLS NS interface choosing what bills to pay right? Now, when I create the User Event, I should deploy it to the Vendor Payment record right? And shouldn’t this be triggered (after submit or before submit) when the vendor payment is created? Since there is a concrete form at that moment, if a validation fails and I cannot proceed with the creation of the Vendor Payment, how do I display errors? Maybe I am confused about this. Thanks in advance