<?php
//$url = 'localhost/api/avanws.php';
$url = 'http://test.papelcero.es/api/avanws.php';
$data = array (
    "grant_type" => "client_credentials",
    "client_secret" => "9b87f76e-def1-4515-9a62-fcefb6a53095",
    "client_id" => "API-ESMDD_dev",
    "service" => "servToken",
    "code" => "8356e8922cdccb82gh538fu2"
);
$headers = [];
$result = curlPost($url,$data,$headers);
print_r($result);
$headers = array(
    'authorization-token: Bearer ' . $result->servToken->client_token,
    'client-id: API-ESMDD_dev',
    'p0-api-key: azt1435gfynunn7wsuyu954vc' 
);
$data = array(
    'service' => 'servPurchaseAUC',
    'id_vehiculo' => '5003344',
    'id_contacto' => '1000001',
    'fecha_reserva' => '2020-06-25 12:12:12',
    'codigo_pago' => 'EEEEEEEEEEE',
    'importe_pago' => '33333.99',
    'merchant_order' => '123456',
    'phase' => '2' 
);
$result = curlPost($url,$data,$headers);
print_r($result);
function curlPost($url,$data,$headers) {
    $ch = curl_init();
    $timeout = 30;
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_POST, TRUE);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    $response = curl_exec ($ch);
    if (curl_errno($ch)) {
        echo 'Error:' . curl_error($ch);
    }
    curl_close ($ch);
    return json_decode($response);
}
?>