src/Core/CoreConstants.php
public static function getQuickBooksOnlineAPIEntityRules()
    {
        return
                         array(
                                    '*'               => array(
                                                                "DownloadPDF" => false,
                                                                "jsonOnly" => false,
                                                                "SendEmail"=> false),
                                    "IPPTaxService"   => array( '*' => false,
                                                                'Add' => true,
                                                                'jsonOnly' => true),
                                    "IPPSalesReceipt" => array( "DownloadPDF" => true, "SendEmail" => true ),
                                    "IPPInvoice"      => array( "DownloadPDF" => true, "SendEmail" => true  ),
                                    "IPPEstimate"     => array( "DownloadPDF" => true, "SendEmail" => true  ),
                            );
    }
public static function getQuickBooksOnlineAPIEntityRules()
    {
        return
                         array(
                                    '*'               => array(
                                                                "DownloadPDF" => false,
                                                                "jsonOnly" => false,
                                                                "SendEmail"=> false),
                                    "IPPTaxService"   => array( '*' => false,
                                                                'Add' => true,
                                                                'jsonOnly' => true),
                                    "IPPSalesReceipt" => array( "DownloadPDF" => true, "SendEmail" => true ),
                                    "IPPInvoice"      => array( "DownloadPDF" => true, "SendEmail" => true  ),
                                    "IPPEstimate"     => array( "DownloadPDF" => true, "SendEmail" => true  ),
                            );
    }
Returns current rules for what operation is supported and what is not for QuickBooks Online API entity
@return array