If you run out of credits before your next billing cycle, you can purchase a one-time top-up. Top-ups are available to active subscribers only.
Several pack sizes are available to cover short-term overflow. Exact pack sizes and pricing are visible in Settings > Billing & Plans once you are signed in.
Top-up credits are added to your balance immediately and are designed for short-term overflow. If you consistently need more, upgrading your plan offers better value.