Simplify low-level client
Only support integer activity IDs in the low-level client as look-up and conversion should be done in the high-level client.
Solves #3 (closed) and requires proposed implementation in !25 (merged).
Only support integer activity IDs in the low-level client as look-up and conversion should be done in the high-level client.
Solves #3 (closed) and requires proposed implementation in !25 (merged).