fix deposit order fee calc

app/services/build_deposit_order.rb

@@ -13,7 +13,7 @@ class BuildDepositOrder
     DepositOrder.new(
       user_id: user_id,
       paid_amount_cents: paid_amount_cents,
-      received_amount_cents: paid_amount_cents + (paid_amount_cents * DEPOSIT_FEE)
+      received_amount_cents: paid_amount_cents - (paid_amount_cents * DEPOSIT_FEE)
     )
   end
 end

spec/services/build_deposit_order_spec.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+require "rails_helper"
+
+RSpec.describe(BuildDepositOrder, type: :service) do
+  describe "#build" do
+    it "returns DepositOrder" do
+      deposit_order = described_class.new(paid_amount_cents: 1000, user_id: 1).build
+
+      expect(deposit_order.paid_amount_cents).to(eq(1000))
+      expect(deposit_order.received_amount_cents).to(eq(950))
+    end
+  end
+end