I want the entire checkout processes to stay on our website domain. Is there a way to combine paypal checkout, google checkout, and credit card checkout all on a website?

How do I do it?

No, the customer have to leave your site to complete the payment at Paypal or Google Checkout.

You can process credit cards directly on your site using paypal Website payments pro.

Paypal payments have to leave the site

Google Checkout Payments have to leave the site.

https://www.paypal.com/cgi-bin/webscr?cmd=_wp-pro-overview-outside

I think Paypal has a spot for certain people, business and situations. It might make sense over a regular merchant account based on that business or persons needs and requirements.

Remember that if you accept payments directly you will need to comply with the pci rules.

Remember that if you accept payments directly you will need to comply with the pci rules.

That is a good point that I think alot of people don't take into consideration.