If an instalment is missed the account may fall into arrears if the contractual minimum is not paid by the payment due date, as stated in your monthly statement.
If the missed instalment(s) is not paid within 60 days from the first missed instalment all instalments will be cancelled.
Without instalments, you can repay at your own pace by setting a scheduled amount and frequency via the 'Custom schedule' option.
Note that interest charges may apply if there is a balance remaining on a purchase outside of the interest free period.
The standard interest rate as mentioned in the account contract will apply to the remaining balance, interest is accrued daily and charged at the end of the month.