> still no paypal integration, Google checkout, stripe, paymil etc.

Not sure what you're aiming at but ERPs are not magento plugins.

I want to be able to send a paypal links or alternate payment methods in my invoices. Like freshbooks does.

Then why not use Freshbooks? Or another SME account SaaS like Xero?

Actually, the v7 has paypal and google checkout integration.

Do you have a link or a doc? I have the latest v7 build running but so far have not found where I setup paypal or google checkout. I also did not find any modules.

Go to Settings > Configuration > Accounting > Then go to the "Bank and Cash" section. You will be able to set up your paypal account, write the email to be sent to customers, add payment processors,... through the "Configure payment acquiring methods" link.