Update to Fern ruby SDK example

Author: Barry-Zou

quickstart/lib/sdk_validation.rb

@@ -1,29 +1,31 @@
 require 'square'
 require 'dotenv/load'
-include Square
 
 client = Square::Client.new(
-  bearer_auth_credentials: BearerAuthCredentials.new(
-    access_token: ENV['SQUARE_ACCESS_TOKEN']
-  ),
-  environment: 'sandbox',
-  timeout: 1
+  token: ENV['SQUARE_ACCESS_TOKEN'],
+  base_url: Square::Environment::SANDBOX
 )
-result = client.locations.list_locations
 
-if result.success?
-  result.data.locations.each do |location|
-    printf("%s: %s, %s, %s\n",
-           location[:id],
-           location[:name],
-           location[:address][:address_line_1],
-           location[:address][:locality])
+begin
+  result = client.locations.list
+
+  if result.locations
+    result.locations.each do |location|
+      printf("%s: %s, %s, %s\n",
+             location.id,
+             location.name,
+             location.address&.address_line_1,
+             location.address&.locality)
+    end
   end
 
-elsif result.error?
-  result.errors.each do |error|
-    warn error[:category]
-    warn error[:code]
-    warn error[:detail]
+rescue => e
+  warn "Error: #{e.message}"
+  if e.respond_to?(:errors) && e.errors
+    e.errors.each do |error|
+      warn error.category
+      warn error.code
+      warn error.detail
+    end
   end
 end