43 CFR §3830.24

1. (a)You or your representative may bring payments to the BLM State Office by close of business on or before the due date.
2. (b)If you use a credit card—
   1. (1)On or before the due date, you must send or fax a written authorization, bearing your signature; or
   2. (2)You may authorize BLM to use your credit card by telephone if you can satisfactorily establish your identity.
3. (c)You may send payments using a bona fide mail delivery service.
   1. (1)The payment must be postmarked or clearly identified by the mail delivery service as being sent on or before the due date; and
   2. (2)The BLM State Office must receive the payment no later than 15 calendar days after the due date.