Add currency_id to billing_subscriptions table

app/Models/BillingSubscription.php

@@ -41,6 +41,7 @@ class BillingSubscription extends BaseModel
         'plan_map',
         'refund_period',
         'webhook_configuration',
+        'currency_id',
     ];
 
     protected $casts = [

database/migrations/2021_03_09_132242_add_currency_id_to_billing_subscriptions_table.php

@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddCurrencyIdToBillingSubscriptionsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('billing_subscriptions', function (Blueprint $table) {
+            $table->unsignedInteger('currency_id')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+    }
+}