Method to create a template category.
https://api.wbsrvc.com/TemplateV2/CreateCategory/
POST
| user_key Required |
User Key of the user who initiates the call. Type: string |
| label Required |
Name of the category. Type: array of languages and names - i.e. array('en_US' => 'Test') |
| default Optional |
Is the category visible by default. Type: string - possible value '0', '1' |
| templates_copyable Optional |
Are the templates in the category copyable. Type: string - possible value '0', '1' |
| client_id Optional |
Client ID of the client in which the category is created. Type: integer |