Set environment variables

Upserts one or more variables, and removes others, in ONE change: { "vars": { "NAME": "value" }, "remove": ["OLD_NAME"] } (either may be omitted, not both). Saving restarts the app once, on the version already running, so the change is live within about a minute — send every change together rather than one request each, or the app restarts once per request. id is a SERVICE id — take it from services[].id on GET /client/apps/{appId}, not the app id itself. Requires apps:deploy.

Names Roar manages are refused, and the refusal says what your app already has.

A 409 means somebody else was saving at the same moment and NOTHING of yours was written — send the same request again. It is never a partial save.