I've integrated Adobe CSDK editor in my web application and used API key given in an example, but now stickers, overlays and frames are not working.
I'm gettimg below errors:
1) Failed to load resource: the server responded with a status of 503 (Service Unavailable) 2) Error getting assets. Please check your authentication parameters.
See below screenshot for your reference.

Stickers, overlays, and frames were end-of-life'd on 11/30/2018. I'm going to paste in the announcement we emailed to Creative CSDK users below:
I ran this email campaign myself, so I know many of the email addresses were old (plus if you opted out of communications, you wouldn't have gotten it). I wish I could suggest another Adobe product to use instead, but at the moment no such products are available.