(Quick Reference)
                Service: Create a discount list
Description: Returns the created discount list in json format when successful. Returns a json response, describing the failure condition when unsuccessful.
URL: 
https://BASE_URL/api/VERSION/discountLists
 Method: POST
Request content type: application/json
Parameters:
| Name | Description | Type | Required | Example values | 
|---|
| reference |   | String | yes |   | 
| name |   | String | yes |   | 
| percentageDiscount | The percentage discount | Double | yes |   | 
| billingCategory | A billing category is a root item category | String/Long | no |   | 
| itemCategories | A list of item categories | JSON list | no | [90,91] | 
A discount list should be assigned either to a billing category or to a list of item categories. 
If you don't specify any of these parameter (billingCategory, itemCategories), discount list will be assigned to all categories. 
Success Output
 Status: HTTP/1.1 201 Created 
{
  "id": 4,
  "reference": "discount70",
  "name": "70% discount",
  "percentageDiscount": 70.0,
  "billingCategory": null,
  "itemCategories": [],
  "organization": "entity1",
  "dateCreated": "2016-06-30T12:23:56Z",
  "lastUpdated": "2016-06-30T12:23:56Z"
} 
 Failure Output
 Status: HTTP/1.1 404 Not Found 
{
    "error": "not_found",
    "error_description": "The item category with the id 1 doesn't exist."
}  Status: HTTP/1.1 400 Bad Request 
{
  "error": "save_failed",
  "error_description": "Failed to save instance"
} 
{
  "error": "invalid_param_type",
  "error_description": "An invalid value was specified for parameter: percentageDiscount (must be positive)"
} 
{
  "error": "not_unique",
  "error_description": "reference already used"
} 
{
  "error": "missing_param",
  "error_description": "name parameter is missing"
}{
    "error": "invalid_param",
    "error_description": "The billing category should be a root item category"
}{
    "error": "rule_validation_error",
    "error_description": "A discount list should be assigned either to a billing category or to a list of item categories."
}  Status: HTTP/1.1 500 Internal Server Error 
 
{
    "error": "server_error",
    "error_description": "Oops! Something went wrong..."
}