mpp-paypalsdk-webconfig-configurations.cshtml

<configuration>
   …
   <paypal>
		<settings>
			<add name="mode" value="sandbox" />
			<add name="connectionTimeout" value="360000" />
			<add name="requestRetries" value="1" />
			<add name="clientId" value="[INSERT_CLIENT_ID]" />
			<add name="clientSecret" value="[INSERT_CLIENT_SECRET]" />
		</settings>
	</paypal>
	<log4net>
		<appender name="FileAppender" type="log4net.Appender.FileAppender">
			<file value="my_app.log" />
			<appendToFile value="true" />
			<layout type="log4net.Layout.PatternLayout">
				<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] %message%newline" />
			</layout>
		</appender>
		<root>
			<level value="DEBUG" />
			<appender-ref ref="FileAppender" />
		</root>
	</log4net>

   …
</configuration>