Is this allowed by Google?

Yes. Asking your customers for a review is fully within Google’s guidelines, and automating the ask just makes sure it happens after every job instead of only when someone remembers.

What crosses the line is buying reviews, faking them, or asking only the customers you know were happy while filtering everyone else away from Google. We do none of that: every customer gets the same well timed ask, and what they write is up to them. Honest volume is the strategy, because steady, real reviews are what map rankings and homeowners both reward.