INSTALL
In file <Frontend>/include/classes/api/API.php :

  Replace : 
'webcheck' => 'CHttpTest'

  With :
'webcheck' => 'CHttpTest',
'valuemapping' => 'CValuemapping'


Copy file CValuemapping.php in <Frontend>/api/classes/ directory

USAGE
GET :
valuemapping.get
valuemapids	array	Return only value mapping that belong to the given valuemapids.
name		string	Return only value mapping that belong to the given name.
with_mappings	flag	Return only valuemapping that have mappings and the mappings datas. 

filter 	object 	Return only those results that exactly match the given filter. Accepts an array, where the keys are property names, and the values are either a single value or an array of values to match against.
search 	object 	Return results that match the given wildcard search. Accepts an array, where the keys are property names, and the values are strings to search for. If no additional options are given, this will perform a LIKE “%…%” search. Works only with text fields.
sortfield	string/array	Sort the result by the given properties. Possible values are: valuemapid, name.
countOutput	flag	These parameters being common for all get methods are described in detail in the reference commentary.
editable 	boolean
excludeSearch 	flag
limit 	integer
output 	query
preservekeys 	flag
searchByAny 	boolean
searchWildcardsEnabled 	boolean
sortorder 	string/array
startSearch 	flag

Examples
Retrieving data by name
Request: 
{
    "jsonrpc": "2.0",
    "method": "valuemapping.get",
    "params": {
        "output": "extend",
        "with_mappings" => true,
        "filter": {
            "name": [
                "Windows service state",
                "Zabbix agent ping status"
            ]
        }
    },
    "auth": "038e1d7b1735c6a5436ee9eae095879e",
    "id": 1
}
Response: 
{
    "jsonrpc": "2.0",
    "result": [
        {
	  "valuemapid":"3",
	  "name":"Windows service state",
	  "mappings":[
	    {
	      "mappingid":"33",
	      "value":"0",
	      "newvalue":"Running"
	    },
	    {
	      "mappingid":"34",
	      "value":"1",
	      "newvalue":"Paused"
	    },
	    {
	      "mappingid":"35",
	      "value":"3",
	      "newvalue":"Pause pending"
	    },
	    {
	      "mappingid":"36",
	      "value":"4",
	      "newvalue":"Continue pending"
	    },
	    {
	      "mappingid":"37",
	      "value":"5",
	      "newvalue":"Stop pending"
	    },
	    {
	      "mappingid":"38",
	      "value":"6",
	      "newvalue":"Stopped"
	    },
	    {
	      "mappingid":"39",
	      "value":"7",
	      "newvalue":"Unknown"
	    },
	    {
	      "mappingid":"40",
	      "value":"255",
	      "newvalue":"No such service"
	    },
	    {
	      "mappingid":"41",
	      "value":"2",
	      "newvalue":"Start pending"
	    }
	  ]
	},
	{
	  "valuemapid":"10",
	  "name":"Zabbix agent ping status",
	  "mappings":[
	    {
	      "mappingid":"68",
	      "value":"1",
	      "newvalue":"Up"
	    }
	  ]
	}
}

Retrieving data by valuemapids
Request: 
{
    "jsonrpc": "2.0",
    "method": "valuemapping.get",
    "params": {
	"valuemapids":[
	    "3",
	    "10"
	],
        "output": "extend"
    },
    "auth": "038e1d7b1735c6a5436ee9eae095879e",
    "id": 1
}
Response: 
{
    "jsonrpc": "2.0",
    "result": [
        {
	  "valuemapid":"3",
	  "name":"Windows service state"
	},
	{
	  "valuemapid":"10",
	  "name":"Zabbix agent ping status"
	}
}

CREATE :
valuemapping.create
name		string	Name of the value mapping
mappings	array	Mapping Values by array :
			value=>10
			newvalue=>"Converted value" 

Create new value mapping and corresponding mapping
Request: 
{
    "jsonrpc":"2.0",
    "method":"valuemapping.create",
    "params":[
      {
	"name":"test1",
	"mappings":[
	  {
	    "value":"value1",
	    "newvalue":"result1"
	  },
	  {
	    "value":"value2",
	    "newvalue":"result2"
	  }
	]
      },
      {
	"name":"test2",
	"mappings":[
	  {
	    "value":"value3",
	    "newvalue":"result3"
	  }
	]
      }
    ],
    "auth":"038e1d7b1735c6a5436ee9eae095879e",
    "id":"1"
}
Response:
{
    "jsonrpc":"2.0",
    "result":{
      "valuemapids":[
	"53",
	"54"
      ]
    },
    "id":"1"
}

DELETE:
valuemapping.delete
Request: 
{
    "jsonrpc":"2.0",
    "method":"valuemapping.delete",
    "params":[
      53,
      54
    ],
    "auth":"038e1d7b1735c6a5436ee9eae095879e",
    "id":"1"
}
Response:
{
    "jsonrpc":"2.0",
    "result":{
      "valuemapids":[
	"53",
	"54"
      ]
    },
    "id":"1"
}

UPDATE:
valuemapping.update
valuemapid	string	(Required) Id of the value mapping to update
name		string	(Optionnal) New Name of the value mapping
mappings	array	(Required) Mapping Values by array :
			"type":"remove",
			"mappingid":"236"
			or
			"type":"add",
			"value":"value45",
			"newvalue":"result45"

Remove mappingid 236 and Add new mapping "value45"
Request: 
{
    "jsonrpc":"2.0",
    "method":"valuemapping.update",
    "params":[
      {
	"valuemapid":"53",
	"mappings":[
	  {
	    "type":"remove",
	    "mappingid":"236"
	  },
	  {
	    "type":"add",
	    "value":"value45",
	    "newvalue":"result45"
	  }
	]
      }
    ],
    "auth":"038e1d7b1735c6a5436ee9eae095879e",
    "id":"1"
}
Response:
{
    "jsonrpc":"2.0",
    "result":{
      "valuemapids":[
	"53"
      ]
    },
    "id":"1"
}

Changing Name
Request: 
{
    "jsonrpc":"2.0",
    "method":"valuemapping.update",
    "params":[
      {
	"valuemapid":"53",
	"name":"new Name test",
	"mappings":[]
      }
    ],
    "auth":"038e1d7b1735c6a5436ee9eae095879e",
    "id":"1"
}
Response:
{
    "jsonrpc":"2.0",
    "result":{
      "valuemapids":[
	"53"
      ]
    },
    "id":"1"
}