P2P mailing now supports sending the cost of a shipment as part of a request. As a result Shiptheory now takes the cost of shipping a shipment from your channel and sends it to P2P.
For international shipments, P2P require you to have a value set for the shipping cost. This cannot be 0.
A new field has been added into P2P's advanced settings section called 'Default Shipping Cost'. The value entered in this field will be used if a shipping cost cannot be found in your channel data and be sent as part of the request to P2P.
In order to make use of this setting, scroll down to advanced settings and enter a value in the 'Default Shipping Cost' field and then press 'Save'.