The current version of the API is
Any incompatible changes to the API will result in incremented versions of the API, which will change the resource URLs.
At some point, the current version will be announced as
Deprecated and you will have 3 months to switch your applications to a newer version of the API.
All clients will be notified of any deprecation in the API.
The documentation describes 2 different varieties of
V3 for Services and V3 for Apps.
The main difference between the services API and apps API is that the apps
are allowed to access only the logins they know about - which they do via the login and customer secret mechanisms,
while the services are allowed to access every login information - mainly via the logins list route.
When an app successfully creates a login, it should store that login’s secret,
and customer’s secret
since it will be needed for further operations involving the login.
The version of the callbacks is in the callback payload, under the
Read more in the callbacks section of the guide.