What is issue in my code Sandbox paypal future payment

Question

I have alredy enable future payments permission in my app and using developer dashboard.but not working yet please find error http://developer.paypal.com/ and log in https://developer.paypal.com/developer/accountStatus there you can see what permits you have.

 $data = array(
                "intent" => "authorize",
                "payer" => array(
                    "payment_method" => "paypal"
                ),
                "transactions" => array(
                    array("amount" => array(
                        "currency" => "USD",
                        "total" => "1.88"
                    ),
                        "description" => "future of sauces")
                ));

        $data_string = json_encode($data);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "https://api.sandbox.paypal.com/v1/payments/payment");
        $headers = array(
            'Content-Type: application/json',
            'PayPal-Client-Metadata-Id: d6743cbb53ea4470a53bfe458f0cb885',
            'Authorization: Bearer A103.B7d5318JDS6NA1zGh02avjCx16oxnBPadUat5z9SlGVGEiOhoAeMuqyz0anGSICS.FAkzECypTS1IXfemHcpVa5yyrGu',
        );
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        //curl_setopt($ch, CURLINFO_HEADER_OUT, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
        $result = curl_exec($ch);
        $information = curl_getinfo($ch);
        curl_close($ch);
        print_r($information);
        die;

Out put here

{"name":"PERMISSION_DENIED","message":"No permission for the requested operation","information_link":"https://developer.paypal.com/docs/api/#PERMISSION_DENIED","debug_id":"5b39efd4cf370"}Array
(
    [url] => https://api.sandbox.paypal.com/v1/payments/payment
    [content_type] => application/json
    [http_code] => 403
    [header_size] => 592

Answer 1

I made a Paypal Module, hope this code would help you.

$result_json = json_decode($result);

/* Check if authentication is valid */
if (isset($result_json->access_token))
{
    $enc_data = json_encode($data);

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://api.sandbox.paypal.com/v1/payments/payment');
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, !in_array($_SERVER['REMOTE_ADDR'], array('127.0.0.1', '::1')));
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_VERBOSE, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $enc_data);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/json',
        'Authorization: Bearer '.$result_json->access_token,
        'PayPal-Client-Metadata-Id: ************'
    ));

    $result = curl_exec($ch);
    $json_result = json_decode($result);
    curl_close($ch);
}

json_encode($data) there are additional information that may not be useful for the transaction you might trying to do but it is an example.

{
    "intent": "sale",
    "payer": {
        "payment_method": "credit_card",
        "payer_info": {
            "email": "...",
            "shipping_address": {
                [...]
            }
        },
        "funding_instruments": [
            {
                "credit_card": {
                    [...]
                    }
                }
            }
        ]
    },
    "transactions": [
        {
            "amount": {
                "total": 32.91,
                "currency": "USD"
            },
            "item_list": {
                "items": [
                    {
                        "quantity": 1,
                        "name": "Product Name",
                        "price": 16.51,
                        "currency": "USD"
                    },
                    {
                        "quantity": 1,
                        "name": "Product Name 2",
                        "price": "16.40",
                        "currency": "USD"
                    },
                    {
                        "quantity": 1,
                        "name": "Shipping",
                        "price": 0,
                        "currency": "USD"
                    }
                ],
                "shipping_address": {
                    [...]
                }
            }
        }
    ]
}