added import and export recurring bills

app/Exports/Purchases/RecurringBills/Sheets/RecurringBills.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace App\Exports\Purchases\RecurringBills\Sheets;
+
+use App\Abstracts\Export;
+use App\Models\Document\Document as Model;
+use Maatwebsite\Excel\Concerns\WithColumnFormatting;
+use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
+
+class RecurringBills extends Export implements WithColumnFormatting
+{
+    public function collection()
+    {
+        return Model::with('category')->billRecurring()->collectForExport($this->ids, ['document_number' => 'desc']);
+    }
+
+    public function map($model): array
+    {
+        $country = null;
+
+        if ($model->contact_country && array_key_exists($model->contact_country, trans('countries'))) {
+            $country = trans('countries.' . $model->contact_country);
+        }
+
+        $model->category_name = $model->category->name;
+        $model->bill_number = $model->document_number;
+        $model->billed_at = $model->issued_at;
+        $model->contact_country = $country;
+
+        return parent::map($model);
+    }
+
+    public function fields(): array
+    {
+        return [
+            'bill_number',
+            'order_number',
+            'status',
+            'billed_at',
+            'due_at',
+            'amount',
+            'currency_code',
+            'currency_rate',
+            'category_name',
+            'contact_name',
+            'contact_email',
+            'contact_tax_number',
+            'contact_phone',
+            'contact_address',
+            'contact_country',
+            'contact_state',
+            'contact_zip_code',
+            'contact_city',
+            'notes',
+        ];
+    }
+
+    public function columnFormats(): array
+    {
+        return [
+            'D' => NumberFormat::FORMAT_DATE_YYYYMMDD,
+            'E' => NumberFormat::FORMAT_DATE_YYYYMMDD,
+        ];
+    }
+}