A photo of your drink, taken here, is what turns a price somebody typed into a price somebody proved. It takes about fifteen seconds and it earns you standing at this venue.
Step 1
A check-in has to come from the venue itself, so we need your actual position rather than the place you searched from.
Step 2
Step 3
It stays private. It is used to verify the serve and to settle disputes, never published.
Points are for keeping information accurate. Checking in repeatedly with the same drink earns almost nothing, by design.