| A vendor changes its API | Your script stops, nobody notices | Detected, fixed under the service | Authentication changes and renamed fields are the single most common cause of a sync dying quietly. Monitoring turns a month of bad data into a same day fix. |
| Two systems disagree about a customer | Whichever synced last wins | Agreed rule decides, conflicts logged | The source of truth decision made in week one is what stops slow, invisible data corruption across a year. |
| A record cannot be matched | Silently skipped or duplicated | Sent to a review queue with a reason | Duplicates created by a well meaning connector are far more expensive to unpick later than to prevent up front. |
| You add a fifteenth system | Another point to point connector | Added to the existing map | Point to point wiring grows painfully. Ten systems wired directly to each other is up to forty five separate connections to maintain. |
| The person who built it leaves | Nobody knows how it works | Documented, handover ready | Key person risk is the quiet reason many internal integrations get replaced rather than repaired. |
| Volume triples in November | Rate limits hit, orders back up | Paced, queued, retried safely | Peak trading is when brittle integrations fail, which is also when failure costs the most. |
| Finance asks what synced last night | Nobody can say for certain | Full record level audit trail | Being able to answer that question is usually what convinces a board the integration is trustworthy. |
| You want to change integrator | Locked into a proprietary black box | Documented, exportable, yours | Worth agreeing in writing at the start, not when the relationship is already ending. |