How to fetch wholesale customer additional details, created under the signup form through the API?

[RishabhD]

Whole sale signup formWhole sale customer admin dashboard

Hi,

For our Wholesale channel, we added few additional fields under the customer signup form and we can see these details filled by the customer under "wholesale"->"customers" admin dashboard.

However when we are trying to fetch the customers through the API, we don't see these additional details in the API response. 

Could you let us know "how and through" which API can we fetch this information ?

Thanks,

Rishabh

[RishabhD]

In addition to the above request, could you also let me know "Using which Shopify liquid object I can fetch these additional details"? 
I want to show these additional details in the customer Invoice sent through the "Order printer pro" app.

Thanks,
Rishabh