Added sandbox to settings

app/models/concerns/quickbooks_oauth.rb

@@ -72,6 +72,10 @@ module QuickbooksOauth
       oauth_consumer_key = Setting.plugin_redmine_qbo['settingsOAuthConsumerKey']
       oauth_consumer_secret = Setting.plugin_redmine_qbo['settingsOAuthConsumerSecret']
 
+      # Are we are playing in the sandbox?
+      Quickbooks.sandbox_mode = Setting.plugin_redmine_qbo['sandbox'] ? true : false
+      logger.info "Sandbox mode: #{Quickbooks.sandbox_mode}"
+
       options = {
         site: "https://appcenter.intuit.com/connect/oauth2",
         authorize_url: "https://appcenter.intuit.com/connect/oauth2",

app/views/qbo/_settings.html.erb

@@ -57,6 +57,13 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
       </td>
     </tr>
 
+    <tr>
+      <th><%=t(:label_sandbox)%></th>
+      <td>
+        <%= check_box_tag 'settings[sandbox]', @settings['sandbox'], @settings['sandbox'] %>
+      </td>
+    </tr>
+
      <tr>
         <th><%=t(:label_oauth_expires)%></th>
         <td><%= if Qbo.exists? then Qbo.first.oauth2_access_token_expires_at end %>