Reddit official app hints to its users about this feature on the app drawer. There you should be able to add links to a variety of different services including less common options. An example would be PayPal, Kickstarter, Twitch, Discord and 22 other services in total.
These links will be displayed under your profile picture as well. This was possible on the web before and now you can use your Android app for advanced profile customisation.
Reddit - Apps on Google Play
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