Sharing field data between plugins (Woocommerce and Userpro)

Hey ho fellow web people.

I have done my best, but I need help please. Perhaps I’m searching the wrong terms, but I can’t find help for what must be a standard-ish function.

I have users log in with Userpro, and then fulfil orders with Woocommerce.

What I’d like to happen is for Woocommerce to read data already entered into Userpro (or even for registrations from now on).

I’ve made concessions and used WC fields such as ‘ billing_address_1 ‘, but I’d like to feed WC with Userpro fields such as ‘ first_name ‘ etc. resulting in the WC Cart being populated with loads of lovely data..

Could someone even help me with what to search for? I assume that ajax has something to do with it, but all my tinkering has been unfruitful.

Thanks for reading, hope someone could spare a few minutes.