Chatbot that can ‘Login’ user for more targeted data

working with botpress, and here is my current flow

Botpress > POST request to Zapier via webhook sending an workflow.email and workflow.password variable > Zapier checks if that email and password exist either in google sheets or zapier table…

My problem is getting the fail or success back to Botpress. My theory (i’m not a developer) is that as soon as Botpress POSTs to Zapier, it’s automatically successful or “true” so the bot flow continues as if it were true instead of false even if you entered nonsense as the email/password

disregard the email and password privacy concern, replace it with literally anything else and it’s the same concept. have any of you come up with a solution to this?