Please note if after clicking the three dots nothing happens, it means Lucky Patcher is missing the Overlay Permissions. Basically, the mod tries to call Lucky Patcher to trigger the window which confirms the purchase, but due to this missing permission, it's unable to show and you see nothing happening. Go to your Phone Settings -> Apps -> Lucky Patcher and make sure all permissions are enabled, including specifically "Overlay Permissions". Depending on your phone model, there could be a separate phone setting to allow apps to display on top of other apps.