If you've come across wpzdjg-cdn-settings.appsflyersdk.com and wondered whether it's safe, here's the short answer: there's no sign of foul play. This isn't a normal website you browse — it's a technical subdomain used by the AppsFlyer SDK to grab configuration settings. The domain structure, the AWS CloudFront hosting, the valid SSL certificate, and the clean blacklist status all point to it being a legitimate part of a well-known mobile attribution service.
What about is wpzdjg-cdn-settings.appsflyersdk.com a scam? There's zero evidence of that. The site returns a straightforward error about a missing Key-Pair-Id, which is typical for a signed-request CDN. It's not a user-facing store or login page, so the usual trust signals like contact info and privacy policies simply don't apply here.
For anyone running apps that use AppsFlyer, this endpoint is expected. There's no reason to treat it as suspicious. If you were worried about safety, you can put that concern aside — this is just a backend piece of infrastructure doing its job.