Work on product costing (broadband) and reporting

app/Interfaces/ProductSupplier.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Interfaces;
+
+use Illuminate\Support\Collection;
+
+interface ProductSupplier {
+	/**
+	 * Return the traffic inclusion with the service
+	 *
+	 * @return mixed
+	 */
+	public function allowance(): Collection;
+
+	/**
+	 * Render the traffic inclusion as a string
+	 *
+	 * @return mixed
+	 */
+	public function allowance_string(): string;
+
+	/**
+	 * Return the product cost
+	 *
+	 * @return float
+	 */
+	public function getCostAttribute(): float;
+}