# Best Practices & Known Limitations

### Best Practices

To ensure the most accurate and reliable results:

1. Provide geocoordinates whenever possible — improves accuracy.
2. Use PreETA only until real-time tracking becomes available.
3. Refresh PreETA whenever the delivery date changes.
4. Avoid caching results by address — predictions vary per delivery day and are continuously updated.


### Testing & Validation

- Monitor API latency and error codes.
- Validate with known address samples.
- For test credentials, contact: customer@bettermile.com


### Known Limitations

- PreETA does not predict the delivery date itself — it relies on the estimated delivery date provided in the request.
- Coverage may be limited in regions without sufficient historical data.
- Contradictory input data can result in no PreETA being returned.