add_filter(
	'gravityflow_step_settings_fields',
	function ( $settings ) {

		if ( rgars( $settings, '1/title' ) === 'Approval' ) {
			$index = array_search( 'expiration', array_column( $settings[1]['fields'], 'name' ), true );
			$index++;

			$approval_text = array(
				'name'    => 'custom_approval_text',
				'label'   => 'Custom Approval Button Text',
				'type'    => 'text',
				'class'   => 'merge-tag-support mt-position-right',
				'tooltip' => 'Enter text that you would like to display instead of "Approve" for this step.',
			);
			array_splice( $settings[1]['fields'], $index, 0, array( $approval_text ) );

            $index++;

			$rejection_text = array(
				'name'    => 'custom_rejection_text',
				'label'   => 'Custom Rejection Button Text',
				'type'    => 'text',
				'class'   => 'merge-tag-support mt-position-right',
				'tooltip' => 'Enter text that you would like to display instead of "Reject" for this step.',
			);
			array_splice( $settings[1]['fields'], $index, 0, array( $rejection_text ) );
		}

		return $settings;
	},
	10,
	2
);

add_filter(
	'gravityflow_approve_label_workflow_detail',
	function ( $approve_label, $step ) {
		return empty($step->__get( 'custom_approval_text' )) ? $approve_label : $step->__get( 'custom_approval_text' );
	},
	10,
	2
);

add_filter(
	'gravityflow_reject_label_workflow_detail',
	function ( $reject_label, $step ) {
        return empty($step->__get( 'custom_rejection_text' )) ? $reject_label : $step->__get( 'custom_rejection_text' );
	},
	10,
	2
);