If you would like to continue to collect leads after you've met your monthly lead allocation, you can enable overages by toggling the Overages option from Disabled to Enabled in Billing>Subscriptions.
You can also enable overages by toggling the Overages option from Disabled to Enabled in Reports.
When you reach your monthly lead allocation, you will automatically purchase any additional leads as needed for your active campaigns at your existing lead rate.
At any time, you can disable overages by toggling the Overages option to Disabled.
Doing so will stop leads from being collected once you reach your monthly lead allocation.