Alternatives to the Google Play billing library - General Questions and Answers

Are there any alternatives (preferably open source) to the Google Play billing library?
I want to add some sort of billing system into my app to sustain myself as a developer, but I don't want to use closed-source APIs, and having to have a separate build/app for F-Droid and the Play Store seems painful.
So, are there any alternatives? If so, does Google Play even allow other billing libraries to be used?
According to: https://techcrunch.com/2022/03/23/g...illing-option-globally-starting-with-spotify/ - Google might allow us to use alternative billing systems, but Idk how truthful this is.
Help would be appreciated.

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[Q] use other in app purchase system than google play

Hey,
I have a question regarding to in app purchase system.
The google developer program policy says about in app purchase:
"Paid and Free Applications
• App purchases: Developers charging for applications and downloads from Google Play must do so by using Google Play's payment system.
• In-app purchases: Developers offering additional content, services or functionality within an application downloaded from Google Play must use Google Play's payment system as the method of payment, except:
o where payment is primarily for physical goods or services (e.g. buying movie tickets; e.g. buying a publication where the price also includes a hard copy subscription); or
o where payment is for digital content or goods that may be consumed outside of the application itself (e.g. buying songs that can be played on other music players)
Developers must not mislead users about the applications they are selling nor about any in-app services, goods, content or functionality they are selling."
The sentence I mark in red says that if I as owner of application, sell a package of notification with some information that the user need another app or program to actually use the information I can use another in app purchase system (i.e. paypal).
My question is:
Is the sentence in blue right?
Thanks in advance,
Shalom Melamed

[Q] Samsung Licensing Considerations

All,
I have noticed that a number of apps available for purchase in the Play Store (for example, the Kaiten e-mail client) are closed-source, paid apps that are merely modifications of stock Android apps.
Samsung releases their modified source code for Android devices, but I'm having difficulty determining whether the licensing agreement would allow developers to modify Samsung source code, and sell the resultant closed-source derivative works in the Play Store.
Any guidance or information would be greatly appreciated - thanks.

Need advise publishing android app and getting paid

Hi,
I recently developed a very simple android app that I want to publish in Google Play. I currently reside in a country where Google doesn't support creation of a Google Merchant Account. I was wondering if there is a way around this?
Thanks.

Some News from Google

Maybe the second part of my post here is interesting for all developers who offer their application(s) for free via Google Play Store but provide a donation capability (even with no release of so-called pro-features) on their websites or via a modified application from locations other than the Play Store.

How do Whatsapp Tracking Apps work (existing on Google Play Store)

I have come accross multiple applications on the Play Store which are able to succesfully track the activity of a Whastapp Number.
I am a web developer myself having basic knowledge in WEB API's etc. I was really intrigued with the accuracy of the app called "WhastLog: online last seen" . My question is what do these applications use to track a number because there are no public API's existing as far as i know, and can i myself try to code and reproduce the results. Anyone who can point me in the right direction is appreciated. I have found a few open source projects on GitHub but most of them require QR code authentication.

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