array( 'Currency' => "Currency", 'Key' => "Key" ), 'numeric' => array( 'CampaignId' => "CampaignId", 'SubscriptionId' => "SubscriptionId", 'Amount' => "Amount" ), 'boolean' => array( 'Paid' => "Paid" ), 'timestamp' => array( 'IssueDate' => "Date" ), 'campaign' => array( 'Campaign' => "CampaignId" ), 'subscription' => array( 'Subscription' => "SubscriptionId" ) ); }