Besides store visits, what's another input needed to measure store sales?

Analysis of Correct Answer(s) - Surveys: This is a key input for measuring store sales lift when direct transaction data is not available. Surveys allow advertisers to directly ask a control group (who didn't see an ad) and an exposed group (who did see an ad) about their purchasing behavior. By comparing the self-reported purchase data between these two groups, you can measure the incremental impact of your ad campaigns on actual in-store sales. This method provides valuable user-reported data that complements store visit metrics to create a more comprehensive view of offline performance.

Analysis of Incorrect Options - location extension information: This is an ad feature that provides your business address and encourages store visits. It is part of the ad campaign setup and helps drive offline traffic, but it is not a measurement input for sales. - maps engagements: Actions like getting directions or clicking to call are strong indicators of intent to visit a store. However, they are engagement metrics that precede a potential sale and do not confirm that a purchase was made. - ad engagements: Metrics like clicks, impressions, or video views measure how users interact with the ad creative online. These are top-of-funnel metrics used to gauge campaign interest and reach, not to measure the final offline sales outcome.