Referring to this doc: https://docs.restate.dev/get_started/tour/#invoking-handlers

In the first step, the provided example body didn't work:
❌ '"seat2B"' (note the surrounding single quotes)
✅ "seat2B" (removed the surrounding single quotes)

From this line:

In the UI, click on the CartObject service, then on Playground, and invoke your handler from there with body '"seat2B"'.

• It works when using the curl example (because of --json flag)
• Doesn't work without the above modification when using the --body flag via Playground (even when content-type is set to json)