You can find the full specification of the SDK here
The SDK Server implements a JSON-RPC specification, so there are a uniform set of methods that clients can rely on. JSON-RPC is a stateless, light-weight remote procedure call (RPC) protocol. It defines several data structures and the rules around their processing. MintBlue clients using the SDK server may utilize different programming languages when implementing the JSON-RPC specification.
More about the JSON-RPC specification can be found here
You can find the SDK Server at http://api.mintblue.com/sdk
The SDK Server uses SDK tokens for authentication. Provide the SDK token in your HTTP headers under key mintblue-sdk-token. Make sure your content-type is set to application/json. Below, an example request is shown.
All buffer values need to be converted to base64, and provided as a string preceded by base64:
In this example we create a Peppol Output on the blockchain, using the SDK Server over JSON-RPC.