How can I pre-populate my billing/shipping information within Commerce? When a user registers on my site, I am asking for their first, last, email and address.

I would like to be able to pass the data I already have along to commerce. So when I get to the /address screen, as much of that form is already pre-populated.

I see this:

{% set modelName = modelName is defined ? modelName : 'address' %}
{% set model = address is defined ? address : null %}


So I (think) the ideal solution is to set the model to the user model. I will never allow guest checkout on this site, yet I want to keep as much flexibility as possible (not delete a bunch of stuff). So I gave this a shot:

{% if currentUser %}
    {% set modelName = modelName is defined ? modelName : 'user' %}
    {% set model = user is defined ? user : null %}
{% else %}
    {% set modelName = modelName is defined ? modelName : 'address' %}
    {% set model = address is defined ? address : null %}
{% endif %}


And I get this error: 

Craft\UserModel and its behaviors do not have a method or closure named "businessName".


Which makes perfect sense - that's not in the user model.

I could go into the form filed and just set the values like this:

&lt;input type="text" id="{{ modelName }}-firstName" class="form-control"
                   name="{{ modelName }}[firstName]"
                   value="{{ currentUser.firstName }}"&gt;


But is that going to lead to disaster? Thank you for any suggestions!
What I gathered from the documentation, you could try this:

{% set customer = craft.commerce.getCustomer() %}


then

{{ customer.address.businessName }}


or it might be 

{{ customer.addresses.businessName }}


https://craftcommerce.com/docs/customer-model