How to use Billing information values to populate user fields at account creation at checkout
I've added a field to the user entity (field_first_name)
Now I'd like to populate it at account creation during checkout (default Rule commerce_checkout_new_account)
with billing information values the user entered during checkout, specifically 'First name'.
I'm using the 'Name (First name, Last name)' widget on the 'billing information' customer profile type.