How to add my product listing in Google Product please Help !

Hello i have a online shopping portal and i want to add my product in Google product search please help me out how can do it. and i have around 5 lacks product collection and please guide also to do submit these product by Google Base API.

 

You can go below link to know details:

http://www.google.com/intl/en_us/products/submit.html

 

Here it is: http://base.google.com/support/bin/topic.py?topic=2916

 

i have around 5 lacks product collection and please guide also to do submit these product by Google Base API.