Fix authentication for new Blink API (OAuth2 - Nov 2025)

[tpgal]

Problem

The original script stopped working in mid-October 2024 due to Blink API changes.
The error "An app update is required" appeared on all login attempts.

Solution

This PR updates the script to use the new OAuth2 authentication endpoint.

Key Changes:

• Migrated from API v4/v5 to OAuth2 endpoint (api.oauth.blink.com)
• Added automatic token refresh mechanism
• Added 2FA support via header

Testing

• Tested on Windows 11 with PowerShell 5.1+
• Successfully authenticates with 2FA
• Downloads videos and thumbnails correctly
• Token refresh working after multiple hours of execution

Fixes issues reported in October-November 2025 by multiple users.

[tpgal]

Solved issue with thumbnails download, replacing the camera/usage endpoint by the homescreen endpoint, which provides the right full path to download the thumbnails.

[will-k-2]

@tpgal Getting login failed as of today when trying to use are you getting the same error?

[sutty550e]

By way of an extra datapoint, I too get login failed today, but not yesterday.

[tpgal]

I'm sorry hearing that, unfortunately I'm on a business trip and won't be able to test it until the weekend. Hope Amazon hasn't decided to change it once again...

[sutty550e]

No rush, I'm grateful for anything you can do, and whenever you can do it. Until 2 days ago, mine hadn't been working for a year, so it was a pleasant surprise to have it working at all. Odd that it only worked for a day, but I suppose they changed things again.

Just so you know, I did not get locked out from 'overuse', which I recall could be a thing, going back a good while in this project. I only logged in about three times, and only for a maximum of 10 minutes per time. Then, I tried again, a day later to check, after I got the update from @will-k-2 that he could not.

[tpgal]

It looks like Amazon has done it again! I have the same issue, and we're not alone:
fronzbot/blinkpy#1147
It will require futher analysis, let's hope it won't be as complex as last time and will just be a minor change...

[tpgal]

I have updated once again the login procedure of the script, following the same approach as in blinkpy #1149. Kudos to @KiraPC for his great work, and in record time!!
The script works again, and at least after the first login, you will receive an automatic email from The Blink Team informing you that a new device has been used to sign into your account (an iPhone 15 Pro! ;-), just ignore that message.

[sutty550e]

Worked a treat for me. Thanks for your efforts, and also to @KiraPC.

[tpgal]

@nayrk The script keeps working, and hopefully Amazon will not change the login procedure for a while. Could you please review this PR, and if it is fine, merge it into the main branch ?

[KDN0691]

Thanks to all, it ill run very fine. But what ist not clear for me, in my cloud are more than 500 videos, but only 109 are downloaded by the first request... My be the others will be loaded be the next time...