Yes, this can be done during checkout.
The premium plan’s limits are so high that it should accept almost any heavy brute-force attack. We constantly monitor if your site is in good shape and if we notice any potential problems we will temporarily increase the limits in case of fair usage. If you are using the free version, the load caused by brute force attacks will be absorbed by your current hosting bandwidth, which could cause your hosting costs to increase.
First, you’ll be notified. Then the cloud will stop accepting requests from your site until you extend your subscription. The protection will not stop working because the system will fail over to the local engine (the free version of the plugin). It will resume the cloud operation automatically after your subscription is up-to-date.
We use Authorize.Net for recurrent payments and they require this information to set up subscriptions.
At this time we don’t offer technical phone support. This allows our team to serve more customers.
Please email us at limitloginattempts[at]gmail.com for assistance retrieving this info.