Meta
The company (formerly Facebook) that owns WhatsApp and operates the WhatsApp Business Platform. In this spoke Meta is the platform owner and first-party documentation publisher: it defines the Cloud API, the WABA model, the template approval regime and pricing, and the Solution-Partner / BSP program.
Relevant nodes drawing on Meta’s docs: whatsapp-business-platform-docs (the WABA reference) and whatsapp-solution-partner (the partner get-started). Client SDKs like wapi-go and BSP vendors like Wassenger build on top of Meta’s API rather than being Meta itself.
Thin node — scoped to Meta’s role as the WhatsApp-platform owner. (Meta’s other facets — the Llama model family, ads, etc. — belong to other spokes if/when they arrive; this node can grow or be superseded by a canonical cross-wiki Meta node then.)