Simply complete the debit order mandate form, where you can specify how many bits you want to automatically purchase monthly – as well as you get to specify money limit of the debit order (since the Zahab bits price fluctuates) – we will not exceed that value. So, no end of the month surprises!
Then on the monthly debit run, your specified bank account will be debited – and your Zahab bits Vault credited with the number of Zahab bits purchased.