Omnipay, paypal with laravel 5

The response i keep getting at dd($finalResponse); is:

RestResponse {#298 ▼
  #statusCode: 400
  #request: RestCompletePurchaseRequest {#300 ▶}
  #data: array:4 [▼
    "name" => "PAYMENT_NOT_APPROVED_FOR_EXECUTION"
    "message" => "Payer has not approved payment"
    "information_link" => "http://ift.tt/1H5sA6x"
    "debug_id" => "5471589613718"
  ]
}

Here is the code.

$gateway = Omnipay::create('PayPal_Rest');

    // Initialise the gateway
    $gateway->initialize(array(
       'clientId' => env('PAYMENT_SANDBOX_PAYPAL_CLIENTID'),
       'secret'   => env('PAYMENT_SANDBOX_PAYPAL_SECRET'),
       'testMode' => true, // Or false when you are ready for live transactions
    ));

    // Do an authorisation transaction on the gateway
    $transaction = $gateway->authorize(array(
        'returnUrl'=> env('PAYMENT_SANDBOX_PAYPAL_URL'),
        'cancelUrl' => 'http://localhost:8000/cancel',
       'amount'        => '10.00',
       'currency'      => 'AUD',
       'description'   => 'This is a test authorize transaction.',
       // 'card'          => $card,
    ));

    $response = $transaction->send();
    if ($response->isSuccessful()) {
       // Find the authorization ID
       $authResponse = $response->getTransactionReference();
       echo "Authorize transaction was successful!\n".$authResponse;
    }else{
        echo "Failed to auth transaction";
        dd($response);
    }

    // Once the transaction has been approved, we need to complete it.
    $transaction = $gateway->completePurchase(array(
        'payerId'             => $request->PayerID,
        'transactionReference' => $authResponse            
    ));

    $finalResponse = $transaction->send();

    dd($finalResponse);

    if ($finalResponse->getData()) {
       echo "Transaction was successful!\n";
       // Find the authorization ID
       $results = $finalResponse->getTransactionReference();
        dd($results);
    }else{
        dd($finalResponse->getData());
    }

After logging in as the payer and completing purchase, what else does the payer need to approve and how?

via Chebli Mohamed