Is there any way send and automated email with temporary credential when a purchase is done?

Hi all, 

any chance someone had a similar need?

it's about automating a flow & sharing data

briefly:

1. A user buys a product. So far so good, alla works well in SquareSpace
2. he gets right away an email. All good here.
3. in the email, I want to display credentials for accessing another system. Basically, the email the user entered for creating an account on SquareSpace, plus a temporary pwd, and a static link.
4. Email and temporary pwd from point 3 are shared with the external platform

My digital product is not about content, but rather proving access to another webapplication.
Still, I'd like to have user management and payments in SquareSpace

Any idea?

cheers,

Alessandro