Simple API integration Wordpress plugin

Hi, I have an affiliate platform, I need to create a wordpress plugin to record a referral when a user visits a specific URL / thank you page. According to the API documentation the code to be triggered when visiting a specific page is : // net order amount // the commission is calculated based on that $net_amount = 1; // appropriate currency code for the referral $currency = 'USD'; // related post ID, order ID, ... $post_id = $order_id; $data = array( 'order_id' => array( 'title' => 'Order #', 'domain' => 'affiliates', 'value' => esc_sql( $order_id ) ), 'order_total' => array( 'title' => 'Total', 'domain' => 'affiliates', 'value' => esc_sql( $net_amount ) ), 'order_currency' => array( 'title' => 'Currency', 'domain' => 'affiliates', 'value' => esc_sql( $currency ) ) ); $r = new Affiliates_Referral_WordPress(); $description = sprintf( 'Order #%s', $order_id ); $r->evaluate( $post_id, $description, $data, $net_amount, null, $currency, null, 'sale' ); Thanks