About two years ago (maybe three), I collected these documents from
various sources. They can be a helpful guideline. I am a third party
consultant without access to CustomerSource or PartnerSource. I've now
installed three retailers and have written custom solutions for all of
them using these documents as a guide.
Grab them while you can from my site:
http://manicsquirrel.com/rms
Also, do not discount the Object Browser in Visual Studio. Use it to
explore the QSRules.dll. It won't help you with the receipt template,
but it will if you decide to create a COM add-in.