Shadowtrack requires a credit card on file at all times for all services. We accept Visa, Discover, American Express, or MasterCard. If you do not have a credit or debit card, simply go to your local bank, grocery, or department store and purchase a prepaid card. We do not offer payment plans. Your card is charged the same day every week. (This day is generally the same day you complete the voiceprint). Please keep in mind if you are using a prepaid card to make note of any charges the card company may add. Some prepaid cards charge transaction fees and/or monthly service fees.