curl --request GET \
  --url https://apimgmt.cometchat.io/apps/{appId}/extensions/email-notification/v1/settings \
  --header 'key: <key>' \
  --header 'secret: <secret>'

{
  "data": {
    "statusCode": 200,
    "success": true,
    "responseTime": 3.061743974685669,
    "body": {
      "data": {
        "settings": {
          "messageDelay": 120,
          "senderEmail": "mymail@example",
          "senderName": "John Doe",
          "sendGridApiKey": "key_1234",
          "sendGridTemplateId": "Template_1234",
          "sendGridUnsubscribeGroupId": "Group_1234",
          "useWebhook": true,
          "webhookURL": "http://example.com",
          "useWebhookBasicAuth": true,
          "webhookUsername": "username",
          "webhookPassword": "fgh356$123ggh**"
        }
      }
    }
  }
}