http://az-az.facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion/business/help/214319341922580
If your campaign is less than 7 days, the total spend will not exceed your daily budget, multiplied by the campaign duration. A budget is the amount of money you want to spend on showing people your ads. It's also a cost control tool. It helps control your overall spend for a campaign or ad set, the same way a bid strategy helps control your cost per result.