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§1 Summary
On Time Delivery Rate (OTDR) is a measurement used to assess a seller's ability to fulfill customer orders within the promised delivery timeframe. OTDR is defined as the percentage of all packages (delivered over a period of 7 calendar days) that take less than 5 business days to be delivered.
From August 25th, 2025, sellers in the UK and EU using the Shipped by Seller (3PL) fulfillment method will receive delivery_sla_time data with each order, enabling better management of delivery expectations. OTDR will impact shop health in the future.
§2 Impact
| Impacted market(s) | * United Kingdom (UK) - Local and cross-border * Europe (EU) - Local |
| Impacted version(s) | * 202309 (and later) |
§3 What's new?
While we aren't introducing any new endpoints or parameters, the existingdelivery_sla_time parameter in the **** POST Get Order List and **** GET Order Details APIs will be populated with data in the UK and EU going forward.
| Parameter | Type | Sample | Description |
|---|---|---|---|
delivery_sla_time | int64 | 1678389618 | Order should arrive by this date to be considered on-time and to avoid late delivery penalties. |
§4 Next steps
Ensure your application can safely handle the additional field data in the response.
Update your integration to pass delivery_sla_time back to your Order Management System (OMS) so that sellers are aware of the delivery SLA time for each order.