Hi Daniel,

To customize pivot table's or pivot matrix's headers or data cells, please their "map" property:

PivotTable::create([
	...
	'map' => array(
		'rowHeader' => function($rowHeader, $headerInfo) {
			// Util::prettyPrint($headerInfo);
			$v = $rowHeader;
			if (isset($headerInfo['childOrder']))
				$v = $headerInfo['childOrder'] . ". " . $v;
			return $v;
		},
		'columnHeader' => function($colHeader, $headerInfo) {
			$v = $colHeader;
			if ($headerInfo['fieldName'] === 'orderYear')
				$v = 'Year-' . $v;
			else if ($headerInfo['fieldName'] === 'orderQuarter')
				$v = 'Quarter-' . $v;

			if (isset($headerInfo['childOrder']))
				$v = $headerInfo['childOrder'] . ". " . $v;
			return $v;
		},
		'dataCell' => function($value, $cellInfo) {
			// Util::prettyPrint($cellInfo);
			$rfOrder = $cellInfo['row']['fieldOrder'];
			$cfOrder = $cellInfo['column']['fieldOrder'];
			$df = $cellInfo['fieldName'];
			$dfOrder = $cellInfo['fieldOrder'];
			// return "$rfOrder:$cfOrder:$df. $value";
			
			return $cellInfo['formattedValue'];
		},
	),
	...
]);

You could modify the values or put them in a classed element for setting colors with CSS, etc. Let us know if you need further help. Thanks!