12am, if the clan doesn't have enough money to pay it, a wan will be sent to the clan's BB. The amount can be fixed or based on the clan size.
upkeep- The base upkeep.
upkeep-enabled- Enable or disable the feature.
multiply-upkeep-by-clan-size- This works as explained above
charge-upkeep-only-if-member-fee-enabled- Enable upkeep if member fee is enabled.