How do I pay for MuscleBox? October 14, 2019 19:55 Follow We accept payment via Visa, MasterCard, Amex and PayPal. Related articles How much will it cost? Where does MuscleBox ship to? Can you really cancel anytime with no cost? How do I update my billing or shipping information? If I cancel my subscription, will I get a refund on any outstanding portions of the subscription I have paid?