Information Access System for Merchant Bankcard SystemUsing the Information Access System. 2–1Introduction2–1The extract and import processes2–2Restart 2–4Backup2–4Program NarrativesSource Code List . 3–1Standard naming conventions .3–1Source code definitions .3–4Extract files.3–4Master file copybooks.3–5Batch programs 3–5Subroutines.3–6Sort f..