Retail card for use exclusively at Shell gas stations and related sites. 25 day grace period for purchases provided you have paid your previous balance in full by the payment due date. You will not be charged interest on purchases if you pay your entire balance by the due day of each month. Cash Advance Fee: Either $10 or 5% of the amount of each cash advance, whichever is greater. Late Payment Fee: Up to $35. Returned Payment Fee: Up to $35.