There are two payment providers to choose in between. First one is Paypal, which allows you to pay from your Paypal balance or with a credit/debit card. You can also setup monthly automatic payments. Pros: simple to use, Cons: expensive fees for micro transactions.
Second one is Cryptonator which allows you to pay with cryptocurrencies such as Bitcoin, Ethereum, Monero and many more. Pros: easy to use, secure, fast, anonymous, low fees. Cons: no support for automatic monthly payments.