if you have your credit card attached in your profile then your droplet wont be deleted but you’ll be charged every month for your usage at end of the month.
if you have paypal, then you have to make pre-pay and before the month end you must refill your account manually. for example, you made payment 20$ through paypal, your droplet wont be destroyed until that amount is not finished.

for such helps, you should always open a support ticket and talk to DO stuff’s directly. this is a community forum.

Thanks I have dollars in DO, then the droplet will not be destroyed, thank you.