| Order to a state where an item is prohibited | Caught at dispatch, if at all | Blocked at checkout with a reason | The explanation matters: a clear message prevents the support contact as well as the breach. |
| Quantity limits | Policed by an alert staff member | Capped per order and per period | Per period caps need customer matching, so duplicate accounts undermine the control. |
| Licence or permit purchases | Emailed copies in a folder | Captured, expiry monitored | An expired credential should stop the next order automatically rather than at audit. |
| Dangerous goods on air freight | Rejected at the depot | Service excluded automatically | Aerosols, flammables and certain batteries are the usual culprits, and rejections cost days. |
| Identification on delivery | Left to the driver to remember | Flagged on the consignment | Also means no authority to leave, which needs to be set rather than assumed. |
| Restricted lines in ad feeds | Removed manually, sometimes | Suppressed by the product flag | Platform policies are stricter than the law in several categories, so the flag should cover both. |
| A regulator asks for records | A week of searching | Exported from the order history | Retention periods differ by category, so the design has to know which applies. |
| Marketplace seller lists a restricted item | Discovered by a customer | Screened at submission | Platform operators carry their own exposure here, separate from the seller’s. |