i have imgur pro account http://ekvador77.imgur.com

and cretaed app:
imageshost.us - callback 0eaa3e9c3cd74c0
imageshost.us - anonimous 31958f5d34aa349
imageshost.us - without callback da6a0389186583c

i want to use imgur api to upload image from my websites visitors , but dont know what app(with callbak or anonymous) to use , and how to authorize app to upload on my imgur account, without browser click

from documentation:
HEADER Authentication
OAuth 2.0
Authentication headers
The OAuth 2.0 Authorization Header. Requires Bearer :token

is there a way to store token on my server side, and upload images without authorization ?