We have introduced a new feature to renew your residentials manually or automatically during a release. Auto billing is NOT ENABLED by default, you have to manually OPT-IN and TAKE ACTION to start the auto billing subscription.
For Residential Plan, click on the 3 dots underneath Actions for any plan. 
From here, you're able to renew immediately, or setup auto renew settings.
This will only be able to charge the original card you used at checkout. You cannot change billing details.
Manual Top Up Requires A 2FA Email to confirm your identity. Once Confirmed Your Plan Is Topped Up!
On this page, you will receive a warning sign that states that by opting in, we will automatically charge your card on file once your data usage reaches 80%. You will have the option to enter a coupon but the coupon MUST be active
You can OPT out of the auto renewal whenever you want, just be sure to continuously update the codes if you are using the same plan for a long period of time as discount codes change.