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The simplest template send: an approved template name, a language code, and body variables.
The sandbox blocks template sends. Test templates against a connected WhatsApp number, not the sandbox.

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Request

curl -X POST "${WHATSAPP_API_URL}/${WHATSAPP_PHONE_NUMBER_ID}/messages" \
  -H "Authorization: Bearer ${WHATSAPP_ACCESS_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
  "messaging_product": "whatsapp",
  "to": "15551234567",
  "type": "template",
  "template": {
    "name": "order_confirmation",
    "language": {
      "code": "en_US"
    },
    "components": [
      {
        "type": "body",
        "parameters": [
          {
            "type": "text",
            "text": "Alex"
          },
          {
            "type": "text",
            "text": "1234"
          }
        ]
      }
    ]
  }
}'
Both the sandbox (WHATSAPP_API_URL) and your own number (META_GRAPH_API_URL) point at the HookMyApp gateway and authenticate with your hmat_… token; the gateway swaps in the real Meta token server-side. The body is identical. See Overview for the full setup.