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WhatsApp Business supports 1:1 conversations. The provider rejects group creation explicitly.

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Starting a conversation

Resolve a user by their WhatsApp phone number in international format with digits only, then open a 1:1 space: 
const wa = whatsappBusiness(app);
const customer = await wa.user("15551234567");
const space = await wa.space.create(customer);

await space.send("Thanks for reaching out.");
Passing more than one user to space.create() throws.