ChatGPT
Claude
PerplexityTemplate or text?
The WhatsApp 24-hour window, which Meta calls the customer service window, starts when a customer messages your business and resets with every new message from them. While it is open you can send normal replies without approval. Once 24 hours pass with no customer message, you can only send pre-approved templates. So: the first message to a customer, or any message after the window closes, is a template; replies inside the window can be plain text. The 24-hour window explained → · What a WhatsApp template is →
Beyond sending messages
The same API key also works for images, documents, buttons and lists, contacts, tags, notes, broadcast groups, WhatsApp Flows and exports — every endpoint is in the API reference. API keys come with usage logs, IP whitelisting and per-key rate limits. Webhooks & API →
