The billing section is used to store your shipping info as well as your payment info. Spoof uses your billing profiles to autofill your information on websites. Currently, Yeezy Supply is supported and more sites will be added in future updates.
The “Import From Billing Converter” button is a feature to seamlessly import your billings into Spoof. If you have your billing profiles already uploaded into the Billing Converter then you can click that button, then select the categories from the billing converter you’d like to upload, press import, and they will all import into Spoof.
For detailed information on the rest of the Billing Converter features, please refer to this guide: https://aycd.zendesk.com/hc/en-us/articles/360038704613-What-is-Billing-Converter-