SSH Key authentication vs Username/Password

[kuttor]

As a user I would like to connect to the BitBucket server and retrieve all repos by using a stored SSH Key, (I suspect via a key-id), instead of username/password -- however, I can't figure out how to do that.... can you help?
For instance:

stash.connect("example.com", "admin", "password")

is shown as an example -- but what if I wanted to use an SSH Key instead?

Thanks for any/all of your help regarding this.

[MaciejKucia]

There is no possibility to use SSH key for REST API.
https://developer.atlassian.com/bitbucket/api/2/reference/meta/authentication