Copy and paste the following line into a text file. See also this faq for information on how to use the configuration file.

www.namecheap.com

# This is a configuration file for
# http://www.namecheap.com/
# dynamic DNS service provider
#
# No change is needed in this file
#
# user interface entries:
# username: enter any host name.
# host: enter your domain name (mydomain.com)


[default]
withpass=0
host=dynamicdns.park-your-domain.com
port=80
path=/update
protocol=http

[requests]
host=%USER%
domain=%HOST%
password=%PASS%
ip=%IP%

[result]
multilines=1
success=<Done>true</Done> 
warning=<Done>false</Done>