Retrieve customer email and oredered items after purchase

Hello!

I need to add a script which sends a follow up email to the customers after purchase.

Here’s the code that I need to add:

require_once 'TrustedShop.php';

try {

  // Provide your own WebAPI key.
  // You can find your WebAPI key on your partner portal.

  $Client = new TrustedShop('0000000000000000');

  // Provide the e-mail address of your customer.
  // You can retrieve the e-amil address from the webshop engine.

  $Client->SetEmail('somebody@example.com');

  // Provide the name of the purchased products.
  // You can get the name of the products from the webshop engine.
  // The AddProduct method must be called for each of the purchased products.
  //
  // It is optional to provide the name of the products, so if this data is not
  // available, you can leave out the AddProduct calls.

  $Client->AddProduct('Name of first purchased product');
  $Client->AddProduct('Name of second purchased product');

  // This method sends us the e-mail address and the name of the purchased
  // products set above. After the data arrived to us, we store them
  // with the time stamp and the WebAPI key.
  // This lets us know that someone has purchased at your webshop, to whom
  // we later have to send the questionnaire for evaluating your shop.
  // The "Send()" operation doesn't send immediately. It generates a HTML output,
  // puts into source of the page and the customer's browser will send the
  // required informations us.

  $Client->Send();

} catch (Exception $Ex) {

  // Here you can implement error handling. The error message can be obtained
  // in the manner shown below. Implementing error handling is optional.

  $ErrorMessage = $Ex->getMessage();
}

Any ideas where should I put this code and how to modify it so that I have the customers email address and ordered items names?

I guess that thankyou.php may be the file, but I don’t know what to do with the code…

https://wordpress.org/plugins/woocommerce/