The Developer Portal now has a full documentation section — every feature walked through against the actual screens, with screenshots — and a Developer Portal entry in the site navigation to get you there.
Signing in to the Developer Portal for the first time now starts with a short guided tour of the main areas, and the whole portal has a dark theme that follows your system setting.
The Seller Support Portal is live: raise a case with the API Platform team from inside the Developer Portal, track its status, and keep the whole exchange in one thread.
Every documentation page — generated API reference included — can now be copied or downloaded as clean Markdown, ready to paste into an editor, a coding assistant, or your own internal docs.