19 CFR §143.43

1. (a)Automation criteria. To be eligible for RLF, a licensed customs broker or importer of record must be:
   1. (1)Operational on the ABI (see 19 CFR part 143, subpart A);
   2. (2)Operational on the EIP prior to applying for RLF; and
   3. (3)Operational on the ACH (or any other CBP-approved method of electronic payment), for purposes of directing the electronic payment of duties, taxes and fees (see 19 CFR 24.25), 30 days before transmitting a RLF entry.
2. (b)Broker must have national permit. To be eligible for RLF, a licensed customs broker must hold a valid national permit (see 19 CFR 111.19(f)).
3. (c)Continuous bond. A RLF entry must be secured with a continuous bond.