19 CFR 143.33: Eligibility criteria for participation.

To be eligible for electronic immediate delivery, electronic entry and electronic entry summary, the filer must be qualified to use the ABI feature, as prescribed in § 143.5. To be eligible for electronic entry summary processing, filers must be authorized to use the ABI statement processing system. Filers not so authorized would have to follow the electronic entry summary with the submission of an entry summary in paper form along with any duties, taxes or fees accruing.