On-site Message
Draft an on-site message for the website inbox / message center (the panel the SDK renders for visitors). Creates it as a DRAFT the user reviews and publishes at /inbox – never goes live on its own. Use for a ONE-OFF, site-wide announcement everyone should see: a launch, a sale window, an outage note, a policy change. Do NOT use it for anything that should fire off a person's behaviour (abandoned cart, welcome, win-back, post-purchase) – that is a Journey with a Website message step, which keeps running after you stop watching. Params: headline (required, <=120 chars), body (required, <=500), button_label (optional), button_url (optional), label (optional eyebrow above the headline), coupon (optional code the reader can copy), days (optional, how long it stays up, default 30).