Integrate the Flattr API in Adblock Plus

Background / User story

As a follow-up to https://gitlab.com/adblockinc/ext/adblockplus/adblockplusui/-/issues/1114, prepare a build with the Flattr API integration.

What to change

• Spec: N/A
• Legal: TBD
• Development:
  • Add support for "flattr-request-payload" events that are signed using a list of authorized keys.
  • For valid requests, respond with a "flattr-payload" event that includes the Flattr status that's associated with the user's Premium license.

Hints for testers

By default, the extension uses its production configuration, so the API will not work on sites that use test/development keys.

In order to change the configuration of the extension to support sites that use test/development keys, you need to adjust the following preferences before activating Premium:

Preference: premium_license_check_url
https://dev.myadblock.licensing.adblockplus.dev/license

Preference: bypass_authorizedKeys

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Hints for translators

N/A