Build applications that send messages to buyers.
With the Messaging API you can build applications that send messages to buyers. You can get a list of message types that are available for an order that you specify, then call an operation that sends a message to the buyer for that order. The Messaging API returns responses that are formed according to the JSON Hypertext Application Language (HAL) standard.
For more information, refer to the Messaging API v1 Use Case Guide.