Problem:

• OnApp does not cap traffic speed for VMs that has reached their monthly traffic limit
• Once customer meets his monthly limit, he should be able to purchase additional traffic on one-time basis

Solution:

In product configuration go to Connect with App → Network
 

• Enable option: Bandwidth limit to start traffic control on this package
  When enabled HostBill will daily check your customer's VM limits/usage
• Setup Data Sent / Data Received limits, you can additionally setup unit (GB/TB) of those limit fields.
  Click on "Allow client to adjust with slider during order" to auto-create Component:Form for this package, that would enable customer to adjust this setting during order.
• Enter "Capped port speed" value - HostBill will set VM port speed to this value, if its monthly traffic limit will be crossed

To setup additional bandwidth packages, proceed to Client Functions tab in product config.

• Enable "Additional Bandwidth" function:
   
• Click on pencil next to Additional Bandwidth feature, proceed to Options tab, here you can setup additional bandwidth packages offered to customer:
  
   

Your clients will now be able to setup additional bandwidth limits in Resources tab: