Your API Key is available in the Accounts System. Please go there and log in. Once you are logged in, you'll see a link on the main page that says Get your API Key.
You can monitor your usage in the Accounts System.
You can change your API plan in the Accounts System.
You can update your account and billing details in the Accounts System.
We prefer not to receive payments with PayPal; it's best if you enter your credit card details in the Accounts System. However, if PayPal is the only way you can pay for the API, we will accept it for annual payments only. Please contact us and we'll arrange your payment for the year.
If you would like to switch to annual billing and receive a 10% discount, simply send us a message. Be sure to include the email address that your account is registered with. We'll confirm with you and then make the switch.
If you've decided you no longer need a paid tier on the API and would like to fully remove your payment details from our secure systems, please send us a message after your most recent invoice has been successfully paid and then we will remove your billing details from our merchant gateway.
There's no real need to delete your account - if you have decided that you no longer need to use your API account, you can just change your Plan in the Accounts System to Basic/Free and stop using the API.
You'll probably have one final invoice from us the next month, which will be pro-rata for the days that you were still on a paid plan, and then that will be it. That way, you can keep your API account and easily always start using it again if you ever need.
That said, if you really, really want to get rid of your account you can send us a message with your account details and we'll confirm and then delete your account for you.