> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hookmyapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Send a one-time passcode template.

```bash theme={null}
curl -X POST "https://gateway.hookmyapp.com/meta/v22.0/${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": "otp_code",
    "language": {
      "code": "en_US"
    },
    "components": [
      {
        "type": "body",
        "parameters": [
          {
            "type": "text",
            "text": "123456"
          }
        ]
      },
      {
        "type": "button",
        "sub_type": "url",
        "index": "0",
        "parameters": [
          {
            "type": "text",
            "text": "123456"
          }
        ]
      }
    ]
  }
}'
```