I think DigitalOcean should charge the plan fee once or offer a yearly fee as well so that we can pay immediately and move on with the project. It seems scary when we think of having insufficient balance on the card the day when we are being charged. one lump sum payment (monthly / yearly) is good enough and then the extra payment (of over usage) can be paid at the end of the plan or adjusted the next month. I think that would be a good option. Cheers.