Implement feature that allow client to pay money to a digialocean account. An example as below.
1. Set an amount to be paid by the client every month/year, better still it can be automatically deducted from their choice of payment evey month/year.
2. The money will be store as virtual money within DigitalOcean, such as the available feature of topping up using paypal.
3. DigitalOcean will deduct the individual droplet charges accordingly.
This will allow people such as web designers to handle multiple clients/droplets using 1 DigitalOcean account and ease the payment flow.