When trying to understand MediaWiki::API badtoken every now and then I found this message in my MediaWiki (version 0.41) object: 

{
  "warnings": {
    "login": {
      "*": "Main-account login via action=login is deprecated and may 
+stop working without warning. To continue login with action=login, se
+e [[Special:BotPasswords]]. To safely continue using main-account log
+in, see action=clientlogin."
    }
  },
  "login": {
    "result": "Success",
    "lguserid": 11,
    "lgusername": "…",
    "lgtoken": "…",
    "cookieprefix": "…",
    "sessionid": "…"
  }
}

[download]

Update

Seems I just had to open the wiki's link mentioned in the object.

Opening that link and logging in, I could create a "Bot-Account" for my account which, when used in login, does not produce the warning anymore.

I have yet to see whether this has any influence on the other issue.

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In reply to MediaWiki::API v0.41 worries by Skeeve

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