When you build an automated transaction ingestion pipeline from banking SMS notifications, your biggest enemy is not malformed text.

Your biggest enemy is duplicate delivery .

Telecommunication networks and banking infrastructure duplicate messages regularly:

Network Retransmission : If a phone travels through a weak cellular zone or hands off between cell towers, carrier SMS gateways frequently deliver the same message twice.

Dual Bank Alerts : Many Indian banks send two distinct notifications for a single POS transaction: first an authorization alert from the card processor (e.g.…