Compatibility with MyData framework requires specific data policing and authorisation mechanism. SDK offers a Python library, but you can also implement your own. Operating with the library requires also a few API endpoints, configuration setups and providing UI views for your users to select the right operator and linking the service. Operator UI functions can be embedded to the service's own views.
Your service needs to announce its MyData capabilities either through a .well-known/mydata URI or similar data can be listed on at least one operator's service registry. This sandbox and it's operator back-end offer tools to form your own developer account and to provide the necessary service descriptions, service icons, basic end-user authentication, and API endpoints for your MyData service.
A service must be tested online against the operator APIs. The SDK has an interactive linking and authorisation/consent provisioning simulation for gaining a deeper understanding of the API calls. For actual testing the sandbox provides service-specific API calls that can be pasted to your favourite RESTful API testing tool.