## Get Carrier Information and Modify PO

We have added three new endpoints to our REST API:

- [Update Purchase Order](/content/developer/dev-article/update-purchase-order/index.html) – use this endpoint to modify a single existing Purchase Order. You can update the corresponding fields in the **General** panel on the PO Details page.
- [Get Shipping Carriers](/content/developer/dev-article/get-shipping-carriers/index.html) – call this endpoint to retrieve the list of valid Shipping Carriers from your server. The response will return the Carrier names and numerical IDs.
- [Get Shipping Services](/content/developer/dev-article/get-shipping-services/index.html) – use this endpoint to retrieve the list of valid Shipping Services per carrier from your server. The response will return the Service names and numerical IDs.