Start work on updating services

app/Models/Supplier/Phone.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Models\Supplier;
+
+use App\Interfaces\SupplierItem;
+use App\Models\Product\Phone as ProductVoip;
+
+final class Phone extends Type implements SupplierItem
+{
+	protected $table = 'supplier_phone';
+
+	/* INTERFACES */
+
+	public function types()
+	{
+		return $this->belongsToMany(ProductVoip::class,$this->table,'id','id','id','supplier_item_id');
+	}
+
+	public function getBillingIntervalAttribute(): int
+	{
+		return 1;	// Monthly
+	}
+}