curl -i -X POST "https://api.box.com/2.0/metadata_templates/schema" \
     -H "authorization: Bearer <ACCESS_TOKEN>" \
     -H "content-type: application/json" \
     -d '{
       "templateKey": "securityClassification-6VMVochwUWo",
       "scope": "enterprise",
       "displayName": "Classification",
       "hidden": false,
       "copyInstanceOnItemCopy": true,
       "fields": [
         {
           "type": "enum",
           "key": "Box__Security__Classification__Key",
           "displayName": "Classification",
           "hidden": false,
           "options": [
             {
               "key": "Classified",
               "staticConfig": {
                 "classification": {
                   "colorID": 7,
                   "classificationDefinition": "Top Seret"
                 }
               }
             }
           ]
         }
       ]
     }'

var field = new BoxMetadataTemplateField
{
    DisplayName = "Classification",
    Type = "enum",
    Key = "Box_Security_Classification_Key",
    Options = new List<BoxMetadataTemplateFieldOption>() 
    {
        new BoxMetadataTemplateFieldOption
        {
            Key = "Classified"
        }
    }
};

var metadataTemplate = new BoxMetadataTemplate
{
    DisplayName = "Classification",
    TemplateKey = "securityClassification-6VMVochwUWo",
    Scope = "enterprise",
    Fields = new List<BoxMetadataTemplateField>() { field },
};

var template = await client.MetadataManager.CreateMetadataTemplate(metadataTemplate);

MetadataTemplate.Field classification = new MetadataTemplate.Field();
classification.setType("enum");
classification.setKey(Metadata.CLASSIFICATION_KEY);
classification.setDisplayName("Classification");
classification.setHidden("false");

List<String> options = new ArrayList<String>();
options.add("Top Secret");
classification.setOptions(topSecret)

List<MetadataTemplate.Field> fields = new ArrayList<MetadataTemplate.Field>();
fields.add(classification);

MetadataTemplate template = MetadataTemplate.createMetadataTemplate(api, Metadata.ENTERPRISE_METADATA_SCOPE, Metadata.CLASSIFICATION_TEMPLATE_KEY, "Classification", false, fields);

from boxsdk.object.metadata_template import MetadataField, MetadataFieldType

fields = [
    MetadataField(MetadataFieldType.ENUM, 'Classification', key='Box__Security__Classification__Key', options=['Top Secret'])
]

template = client.create_metadata_template('Classification', fields, template_key='securityClassification-6VMVochwUWo')

client.metadata.createTemplate(
		'Classification',
		[
      {
        type: "enum",
        key: "Box__Security__Classification__Key",
        displayName: "Classification",
        hidden: false,
        options: [
         {
           key: "Classified",
           staticConfig: {
             classification: {
               colorID: 7,
               classificationDefinition: "Top Seret"
             }
           }
         }
       ]
      }
    ],
		{
			hidden: false,
			templateKey: 'securityClassification-6VMVochwUWo'
		}
	)
	.then(template => {
		// the new classification template
	});