There are some instances where your credit card will be charged immediately, including:
SIM shipment: If you require a new SIM card (based on the type of shipping method selected)
Data Packs: 1GB top-ups available for $10. Data Packs can be added a la carte or automatically in 1GB increments.
International Roaming and International Calling: Credit can be added to your International Roaming wallet in $5, $10, and $20 increments.