To grant Teapplix API access to your PayPal account to download orders, click on the gear sign on top right of your PayPal page:
Some older accounts have a different choice to get to API Access:
In any case, click on 'Update' next to API access, you will go to a page to Grant API permissions:
If you see the following page, click on 'Setup PayPal API credentials and permissions' link, if not, you should be straight at next page:
On this page, type "xyan_api2.teapplix.com' and click on "Lookup"
On the resulting page, verify you see 'Teapplix Inc' and check the 2 check-boxes indicated below and push 'Add' button: