IBM Watson Text Analysis set up

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{
“apikey”: “**************************************************”,
“iam_apikey_description”: “Auto-generated for key b43314be-60b8-4b81-95a6-11fd4aa014e5”,
“iam_apikey_name”: “Auto-generated service credentials”,
“iam_role_crn”: “crn:v1:bluemix:public:iam::::serviceRole:Manager”,
“iam_serviceid_crn”: “crn:v1:bluemix:public:iam-identity::a/e3f327b916ce419ba5b5218ab5397a6c::serviceid:ServiceId-5578b0a5-d020-461d-b2ea-be4a21df2c27”,
“url”: “https://api.eu-gb.natural-language-understanding.watson.cloud.ibm.com/instances/cff7b038-9652-4cbc-b49a-c42c397db0fb”
}

These are my credential i am using api key and URL but it gives null result please guide me how to setup please guide me