Change Lightning balance property

... so that clients can use the same property with all balances

app/controllers/api/btcpay_controller.rb

@@ -1,5 +1,6 @@
 class Api::BtcpayController < Api::BaseController
   before_action :require_feature_enabled
+  before_action :set_cors_access_control_headers
 
   def onchain_btc_balance
     balance = BtcpayManager::FetchOnchainWalletBalance.call
@@ -26,4 +27,10 @@ class Api::BtcpayController < Api::BaseController
         http_status :not_found and return
       end
     end
+
+    def set_cors_access_control_headers
+      headers['Access-Control-Allow-Origin'] = "*"
+      headers['Access-Control-Allow-Headers'] = "*"
+      headers['Access-Control-Allow-Methods'] = "GET"
+    end
 end

app/services/btcpay_manager/fetch_lightning_wallet_balance.rb

@@ -4,7 +4,7 @@ module BtcpayManager
       res = get "stores/#{store_id}/lightning/BTC/balance"
 
       {
-        balance: res["offchain"]["local"].to_i / 1000 # msats to sats
+        confirmed_balance: res["offchain"]["local"].to_i / 1000 # msats to sats
       }
     end
   end