In our reseller account under billing and then under Auto Replenishment

A small add on to it would be good where we have 2 options there.

Option A:

Have the option you currently have were you will charge our card for the current amount due in the account.

Option B:

Have some options where you can setup a preset amount to be charged

1. when the account gets to whatever amount.
2. setup a re occurring bill cycle in the schedule provided by us to be charged every so many to add more credit to our account.

For most starting out and some seasoned resellers this option may not suite their needs but for the ones that are further up the chain this will greatly benefit us and save us a lot of time to focus on other things.