function _wpec_get_checkout_token( $product, $return_url ) {
    global $wpdb, $wpsc_cart, $current_user;

    wpsc_empty_cart();
    // Manually add the product to the WPEC cart
    $_POST['product_id'] = $product->get_id();
    $_POST['collected_data'] = false;
    wpsc_add_to_cart();

    // Duplication of code in wpsc_submit_checkout, removes all shipping, tax & validation related routines
    do_action( 'wpsc_before_submit_checkout' );
    $sessionid = (mt_rand( 100, 999 ) . time());
    wpsc_update_customer_meta( 'checkout_session_id', $sessionid );

    $wpsc_checkout     = new wpsc_checkout();
    $submitted_gateway = 'paypal-digital-goods'; // Only allow one payment gateway for now

    // Keep track of tax if taxes are exclusive
    $wpec_taxes_controller = new wpec_taxes_controller();

    if ( ! $wpec_taxes_controller->wpec_taxes_isincluded() ) {
        $tax = $wpsc_cart->calculate_total_tax();
        $tax_percentage = $wpsc_cart->tax_percentage;
    } else {
        $tax = 0.00;
        $tax_percentage = 0.00;
    }

    $total = $wpsc_cart->calculate_total_price();

    $args = array(
        'totalprice'       => $total,
        'statusno'         => '0',
        'sessionid'        => $sessionid,
        'user_ID'          => $current_user->ID, // This should be set in WPOAuthProvider::plugins_loaded()
        'date'             => time(),
        'gateway'          => $submitted_gateway,
        'billing_country'  => $wpsc_cart->selected_country,
        'shipping_country' => $wpsc_cart->delivery_country,
        'billing_region'   => $wpsc_cart->selected_region,
        'shipping_region'  => $wpsc_cart->delivery_region,
        'base_shipping'    => 0,
        'shipping_method'  => '',
        'shipping_option'  => '',
        'plugin_version'   => WPSC_VERSION,
        'discount_value'   => $wpsc_cart->coupons_amount,
        'discount_data'    => $wpsc_cart->coupons_name,
        'find_us'          => '',
        'wpec_taxes_total' => $tax,
        'wpec_taxes_rate'  => $tax_percentage
    );

    $purchase_log = new WPSC_Purchase_Log( $args );
    $purchase_log->save();
    $purchase_log_id = $purchase_log->get( 'id' );
    $wpsc_checkout->save_forms_to_db( $purchase_log_id );
    $wpsc_cart->save_to_db( $purchase_log_id );
    $wpsc_cart->submit_stock_claims( $purchase_log_id );

    $wpsc_cart->log_id = $purchase_log_id;

    do_action( 'wpsc_submit_checkout', array( 'purchase_log_id' => $purchase_log_id, 'our_user_id' => $current_user->ID ) );
    do_action( 'wpsc_submit_chekcout_gateway', $submitted_gateway, $purchase_log );

    // Submit to PayPal Digital Goods to request token
    $options = array(
        'cancel_url' => add_query_arg( array( 'cancel_payment' => $product->get_slug() ), $return_url )
    );

    $gateway = wpsc_get_payment_gateway( $submitted_gateway );
    $gateway->gateway->set_options( $options );

    $gateway->set_purchase_log( new WPSC_Purchase_Log( $purchase_log_id ) );
    $checkout_url = $gateway->process( array( 'return_only' => true ) );

    // Store the confirmed_payment_redirect URL for this transaction
    set_transient( 'wpec_payment_details_' . $sessionid, array( 'redirect_uri' => $return_url, 'product_slug' => $product->get_slug() ), 60 * 60 );

    return $checkout_url;
}