invoices = $invoices; } public function array(): array { return $this->invoices; } public function headings(): array { return ['ID', 'Tanggal','Tahun', 'Bulan', 'Provinsi', 'Nama UPT', 'Kategori', 'Judul', 'Deksripsi', 'Keterangan' ,'Kontributor']; } public function startCell(): string { return 'A1'; } }