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Nothing outside the APK knows this package by name - an in-house module, or a private SDK. What follows is what the code itself says.

In 20% of apps checked

What it contains3

Classes under this package in the newest build that carries it - KupujemProdajem 3.2.0 build 1288.

Each app's newest build, the most recently checked first. Where the version comes from is the file that states it.

App	App version	Classes
KupujemProdajem com.kupujemprodajem.android	3.2.0 build 1288	3
Parking Srbija com.mnocompany.paypark	2.1.18	23
Allegro pl.allegro	9.95.1	4
Vita Mahjong com.vitastudio.mahjong	3.42.1	38
Block Blast! com.block.juggle	10.8.4	10
Discord com.discord	349.9 - Stable	7
Mein dm de.dm.meindm.android	6.20.0	44
Shazam com.shazam.android	16.63.0-261008	5
Proton VPN ch.protonvpn.android	5.20.74.0	107
LC Waikiki com.lcwaikiki.android.global	4.0.64	5
Indomio it.immobiliare.android	26.16.0	8
Tile Explorer com.oakever.tiletrip	2.3.0	38
and more