SC: Service Code. 3 digits:
Digit 1 (most significant): Interchange and technology:
0: Reserved for future use by ISO.
1: Available for international interchange.
2: Available for international interchange and with integrated circuit, which should be used for the financial transaction when feasible.
3: Reserved for future use by ISO.
4: Reserved for future use by ISO.
5: Available for national interchange only, except under bilateral agreement.
6: Available for national interchange only, except under bilateral agreement, and with integrated circuit, which should be used for the financial transaction when feasible.
7: Not available for general interchange, except under bilateral agreement.
8: Reserved for future use by ISO.
9: Test.
Digit 2: Authorization processing:
0: Transactions are authorized following the normal rules.
1: Reserved for future use by ISO.
2: Transactions are authorized by issuer and should be online.
3: Reserved for future use by ISO.
4: Transactions are authorized by issuer and should be online, except under bilateral agreement.
5: Reserved for future use by ISO.
6: Reserved for future use by ISO.
7: Reserved for future use by ISO.
8: Reserved for future use by ISO.
9: Reserved for future use by ISO.
Digit 3 (least significant): Range of services and PIN requirements:
0: No restrictions and PIN required.
1: No restrictions.
2: Goods and services only (no cash).
3: ATM only and PIN required.
4: Cash only.
5: Goods and services only (no cash) and PIN required.
6: No restrictions and require PIN when feasible.
7: Goods and services only (no cash) and require PIN when feasible.
8: Reserved for future use by ISO.
9: Reserved for future use by ISO.
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