Where is the documentation for writing Magento Extensions?

Question

I have looked and looked on their website, I have tried many google searches, but I can't find a link to documentation on how to write extensions for the Magneto ECommerce software. I want to write a simple payment gateway which I'm more than capable of doing if I could find basic documentation.

Any ideas?

Answer 1

Maybe this helps

http://t.wits.sg/2009/03/31/howto-repackageable-custom-extension-development-in-magento-part-5-crud-retrieve/

Answer 2

I followed the steps in the magento wiki , for creating a custom payment gateway.

How to create a payment method module

Answer 3

There is no official documentation for Magento developers, except for the 1st of April joke one (APR 1st Magento Documentation)