curl -X POST https://api.box.com/2.0/metadata_templates/schema \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -H 'Content-Type: application/json" '
     -d '{
      "scope": "enterprise",
      "displayName": "Customer",
      "fields": [
        {
          "type": "string",
          "key": "name",
          "displayName": "Name",
          "description": "The customer name",
          "hidden": false
        },
        {
          "type": "date",
          "key": "last_contacted_at",
          "displayName": "Last Contacted At",
          "description": "When this customer was last contacted at",
          "hidden": false
        },
        {
          "type": "enum",
          "key": "industry",
          "displayName": "Industry",
          "options": [
            {"key": "Technology"},
            {"key": "Healthcare"},
            {"key": "Legal"}
          ]
        },
        {
          "type": "multiSelect",
          "key": "role",
          "displayName": "Contact Role",
          "options": [
            {"key": "Developer"},
            {"key": "Business Owner"},
            {"key": "Marketing"},
            {"key": "Legal"},
            {"key": "Sales"}
          ]
        }
      ]
    }'

var templateParams = new BoxMetadataTemplate()
{
    TemplateKey = "marketingCollateral",
    DisplayName = "Marketing Collateral",
    Scope = "enterprise",
    Fields = new List<BoxMetadataTemplateField>()
    {
        new BoxMetadataTemplateField()
        {
            Type = "enum",
            Key = "audience",
            DisplayName = "Audience",
            Options = new List<BoxMetadataTemplateFieldOption>()
            {
                new BoxMetadataTemplateFieldOption() { Key = "internal" },
                new BoxMetadataTemplateFieldOption() { Key = "external" }
            }
        },
        new BoxMetadataTemplateField()
        {
            Type = "string",
            Key = "author",
            DisplayName = "Author"
        }
    }
};
BoxMetadataTemplate template = await client.MetadataManager.CreateMetadataTemplate(templateParams);

MetadataTemplate.Field metadataField = new MetadataTemplate.Field();
metadataField.setType("string");
metadataField.setKey("text");
metadataField.setDisplayName("Text");

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

MetadataTemplate template = MetadataTemplate.createMetadataTemplate(api, "enterprise", "CustomField", "Custom Field", false, fields);

final JsonObject jsonObject = new JsonObject();
jsonObject.add("text", "This is a test text");

Metadata metadata = new Metadata(jsonObject);
boxFile.createMetadata("CustomField", metadata);

from boxsdk.object.metadata_template import MetadataField, MetadataFieldType

fields = [
    MetadataField(MetadataFieldType.STRING, 'Name')
    MetadataField(MetadataFieldType.DATE, 'Birthday', 'bday')
    MetadataField(MetadataFieldType.ENUM, 'State', options=['CA', 'TX', 'NY'])
]
template = client.create_metadata_template('Employee Record', fields, hidden=True)
print('Metadata template ID {0}/{1} created!'.format(template.scope, template.templateKey))

// Create a new template, but hide it for now until it's ready for use
client.metadata.createTemplate(
		'Vendor Contract',
		[
			{
				type: 'date',
				key: 'signed',
				displayName: 'Date Signed'
			},
			{
				type: 'string',
				key: 'vendor',
				displayName: 'Vendor'
			},
			{
				type: 'enum',
				key: 'fy',
				displayName: 'Fiscal Year',
				options: [
					{key: 'FY17'},
					{key: 'FY18'},
					{key: 'FY19'}
				]
			}
		],
		{
			hidden: true,
			templateKey: 'vcontract'
		}
	)
	.then(template => {
		/* template -> {
			id: '17f2d715-6acb-45f2-b96a-28b15efc9faa',
			templateKey: 'vcontract',
			scope: 'enterprise_12345',
			displayName: 'Vendor Contract',
			hidden: true,
			fields: 
			[ { type: 'date',
				key: 'signed',
				displayName: 'Date Signed',
				hidden: false },
				{ type: 'string',
				key: 'vendor',
				displayName: 'Vendor',
				hidden: false },
				{ type: 'enum',
				key: 'fy',
				displayName: 'Fiscal Year',
				options: 
					[ { key: 'FY17' },
					{ key: 'FY18' },
					{ key: 'FY19' } ],
				hidden: false } ] }
		*/
	});

var templateFields: [MetadataField] = []
templateFields.append(MetadataField(
    type: "string",
    key: "name",
    displayName: "Full Name"
))
templateFields.append(MetadataField(
    type: "date",
    key: "birthday",
    displayName: "Birthday"
))
templateFields.append(MetadataField(
    type: "enum",
    key: "department",
    displayName: "Department",
    options: [
        ["key": "HR"],
        ["key": "Sales"],
        ["key": "Marketing"],
    ]
))
client.metadata.createTemplate(
    scope: "enterprise",
    templateKey: "personnelRecord",
    displayName: "Personnel Record",
    hidden: false,
    fields: templateFields
) { (result: Result<MetadataTemplate, BoxSDKError>) in
    guard case let .success(template) = result {
        print("Error creating metadata template")
        return
    }

    print("Created metadata template with ID \(template.id)")
}