The self-serve signup flow that lets a hotel connect its own WhatsApp Business Account to Hello Hotel and start messaging — covering the WhatsApp/Meta signup, number verification, approval steps, and mapping the connected account to the right property. Implementation path is still being decided (leaning toward Telnyx's hosted signup flow). Target: late summer 2026. Note: WhatsApp can already be enabled manually per property by request today; this ticket is the widely available, self-serve version.