This rule identifies suspicious patterns of round-amount transactions at individual terminals that deviate from normal customer behavior.

System flags when:
1. Multiple transactions at same terminal use exact round amounts
2. Amounts like 1000, 5000, 10000 AED (perfectly divisible)
3. Pattern concentration at single terminal location

Round amount patterns are suspicious because:
- Real customers rarely purchase in perfectly round amounts
- Common in money laundering (moving specific amounts)
- Used in card testing (fraudsters test with round numbers)
- May indicate merchant self-dealing or fraud
- Pattern of internal theft (employees processing fake transactions)

Terminal concentration is significant because:
- Indicates localized fraud activity
- Suggests specific terminal/location compromise
- May involve merchant employee collusion
- Easier to investigate and remediate single terminal

Alert enables:
- Terminal security inspection
- Employee activity review at location
- Transaction receipt/documentation validation
- Pattern correlation with other fraud indicators