Refactor BTCPay service and API, add lightning balance

app/services/btcpay_manager_service.rb

@@ -0,0 +1,22 @@
+#
+# API Docs: https://docs.btcpayserver.org/API/Greenfield/v1/
+#
+class BtcpayManagerService < LdapService
+  def initialize
+    @base_url   = Setting.btcpay_api_url
+    @store_id   = Setting.btcpay_store_id
+    @auth_token = Setting.btcpay_auth_token
+  end
+
+  private
+
+    def get(endpoint)
+      res = Faraday.get("#{@base_url}/#{endpoint}", {}, {
+        "Content-Type" => "application/json",
+        "Accept" => "application/json",
+        "Authorization" => "token #{@auth_token}"
+      })
+
+      JSON.parse(res.body)
+    end
+end