While our credit card payment option is processed as post-payment (you are charged each month on the 1st of the month for your usage in the previous month), PayPal payments are considered pre-paid and are not automatic. Loading $5 into your account is just that, there are no automatic payments or subscriptions offerings for paying for your DigitalOcean service via PayPal. This means that while you will not have to worry about being surprised by an automatic payment you are also responsible for ensuring that you maintain enough credit on your account between your coupon and payments to cover the costs of your services.