To use the Webapp's "Search by location" feature - it sounds like you need to have a Google Projects API Key (https://help.siteglide.com/en/articles/4470350-webapps-searching-by-location-full-example)

When I review the Google docs on how to obtain a key (https://developers.google.com/places/web-service/get-api-key), you need a billing account. 

Does anyone have any idea of costs associated with this? I need to provide an estimate for a client. 

Thanks