make the key for the product_id clearer

Author: lsmith77

src/Console/Commands/CreateStripePlans.php

@@ -56,7 +56,7 @@ public function handle()
 
     protected function getProductId()
     {
-        return Spark::$details['product_id']
+        return Spark::$details['stripe_product_id']
             ?? strtolower(str_replace(' ', '-', Spark::$details['product']));
     }
 
@@ -75,7 +75,7 @@ protected function createProduct()
             $this->line('Stripe product ' . $id . ' already exists');
         } catch (\Exception $e) {
             Stripe\Product::create([
-                'id'                   => $id,
+                'id'                   => $this->getProductId().'-'.$id,
                 'name'                 => Spark::$details['product'],
                 'statement_descriptor' => Spark::$details['vendor'],
                 'unit_label'           => 'JobAds',