Not able to verify Purchase Code with Item ID Please help me.

Yeah, looks like you forgot to authenticate your API request with a personal token. You need to add the Authorization and User-Agent headers per the post linked by @mgscoder:

$header   = array();
$header[] = 'Content-length: 0';
$header[] = 'Content-type: application/json; charset=utf-8';
$header[] = 'Authorization: Bearer PERSONAL_TOKEN_HERE';
$header[] = 'User-Agent: Purchase code verification on mywebsite.com';

Here is a fully working code sample for verifying purchase codes, if you want to reference it:

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