Send a template-style message and validate channel compatibility.
curl -X POST "https://api.wazapin.id/v1/messages" \ -H "X-Api-Key: YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "channel_id": "wzp_wu8f3k2p", "to": "6281234567890", "type": "template", "template": { "template_name": "order_update", "language": "en", "components": [] } }'