Could use an example of how to use PaypalExpress about aktive-merchant HOT 1 CLOSED

Paypal gives you information about what and when to execute a method.

1. You need to setup an authorize or purchase action. Lets say purchase ok? You need the amount of transaction and 2 urls from your site. In my example is:

    $response = $gateway->setup_purchase($_POST['amount'], array(
      'return_url' => 'http://localhost/merchant/test/paypal_express/index.php',
      'cancel_return_url' => 'http://localhost/merchant/test/paypal_express/index.php?cancel=1',
      )
    );

return_url: the url for success transaction
cancel_url: url to return if customer press cancel on paypal site.

2. setup_purchase will generate the necessary token and the url to redirect your customer.

die ( header('Location: '. $gateway->url_for_token( $response->token() )) );

Also paypal will sent you some info. make a var_dump to $response or

Merchant_Logger::print_ar($response);

3. Your customer pays on paypal site, and paypal will return to your site via return url you send in step 1.
   Now you execute the method:

$response = $gateway->get_details_for( $_GET['token'], $_GET['PayerID']);

Again must see the fields you need from response with

Merchant_Logger::print_ar($response);

Gather what you want and proceed to the final transaction.

4. Final transaction:

$response = $gateway->purchase($response->amount());

Check if it is success via

$response->success() == true; 

from aktive-merchant.