Registration Process - Redirect to sales page (or OTO) after first login

Hi there,

Greetings!

Would it be possible to modify the registration process using pro-sites in one of the following was:

Method 1
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Is there a way in which we could modify the registration process such that, the user would be re-directed to the sales-page (or an oto page) after the first login?

or

Method 2
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Would it be possible to create a registration process for subsites like the user registration on the WPMUDev Join (https://premium.wpmudev.org/join/) site?

i.e. in ajax, the user could say sign-up, then:

Step 1 - Select username
Step 2 - Select Sub-site domain
Step 3 - Select payment plan
Step 4 - Confirm email (optional)

Then login.

Thanks, Best Regards,
Santosh