This rule implements specialized monitoring for extraordinarily high-value transactions using locally-issued cards.

Triggers when:
1. Single transaction amount exceeds AED 500,000
2. Card is classified as a domestic/local card (issued within UAE)
3. Amount represents significant financial exposure

Transactions at this level require enhanced validation because:
- Represents major financial risk if fraudulent
- Uncommon even for high-value legitimate business purchases
- Could indicate business email compromise leading to fraudulent payment authorization
- May involve insider fraud or collusion
- Requires executive approval in most legitimate business contexts
- High potential for dispute/chargeback due to buyer remorse or fraud discovery

Transaction placed on HOLD for:
- Multi-level verification
- Merchant contact to confirm legitimacy
- Cardholder authentication
- Executive authorization review