We don't guarantee backward compatibility for the API endpoints that are not listed in our public API documentation, so you should not use them.
What changes does doo consider to be “backward-compatible”?
Adding new API resources.
Adding new optional request parameters to existing API methods.
Adding new properties to existing API responses.
Changing the order of properties in existing API responses.
Changing the length or format of object IDs or other opaque strings.
API changelog
Note that this changelog only reflects backward-incompatible updates.
Keep track of changes and upgrades to the doo API.
(no changes yet)