We currently use the platform Podium and have had some pretty good success with it. With that being said, Yelp's policies don't allow you to request reviews from customers so we are only using the platform now to help generate reviews to Google and Facebook. Definitely makes for an easy process, and each of our foremen have their own login so they can send requests to customers while on site.
There are a handful of cheaper alternatives, but I'd definitely recommend jumping onto one of the platforms!
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