I have developed an extension to list the provinces and cities for the South Africa.I need to use this extension in the billing information section in the one page checkout(replacing the existing fields country,state/province, cities) how should I do this
Could this not be archived by editing the onepagecheckout files and then extending/referencering your code in these files from your module ?
If you build a module, I would assume you have the skills to do this or did I misunderstand your question
I will try it
Did you try the custom checkout fields module by FMEExtensions?
Why would you need any extension? just populate the directory_country_region, directory_country_region_name table in magento for your coutry and you will be good to go.