How to find x-identity & x-signature in Bitpay (docs) - php

Question

I'm integrating bitpay in my project
but when i hit api "https://test.bitpay.com/invoices" it give response { error : "Invalid-Signature" }
https://bitpay.com/api/#rest-api-resources-invoices-create-an-invoice
$resourceUrl = 'https://test.bitpay.com/invoices';
$postData = json_encode([
'currency' => 'EUR',
'price' => 10,
'orderId' => 'MerchantOrder123',
'fullNotifications' => true,
'extendedNotifications' => true,
'transactionSpeed' => 'medium',
'notificationURL' => 'https://yournotificationurl.com',
'notificationEmail' => 'merchant#email.com',
'redirectURL' => 'https://yourredirecturl.com',
'buyer' => [
'email' => 'fox.mulder#trustno.one',
'name' => 'Fox Mulder',
'phone' => '555-123-456',
'address1' => '2630 Hegal Place',
'address2' => 'Apt 42',
'locality' => 'Alexandria',
'region' => 'VA',
'postalCode' => '23242',
'country' => 'US',
'notify' => true
],
'posData' => 'tx1234',
'itemDesc' => 'Item XYZ',
'token' => '6oE1tYw1xMqUjM97dk57cwbda5sxbXTkUgg7UKpwkzEE'
]);
$curlCli = curl_init($resourceUrl);
curl_setopt($curlCli, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($curlCli, CURLOPT_HTTPHEADER, [
'x-accept-version: 2.0.0',
'Content-Type: application/json',
'x-identity: 02e6228330bb3f4887ec4eb650dc52d668172a7de39076281e030c03bba10bd8a6',
'x-signature: 304502207f4ee84d8d2ff46439ed3958c1b2a1c3efefba0455d5d4ce213d855075bd6353022100ccf8df1b6f1934124ddbc034fb0eddab6bba0a538919bb87a6cf5a0a8f030fda'
]);
curl_setopt($curlCli, CURLOPT_POSTFIELDS, stripslashes($postData));
$result = curl_exec($curlCli);
curl_close($curlCli);
echo $result;