Recently, Rockstar Games updated the official website for GTA 6, showing that the game has received an M (Mature) rating from the ESRB, along with an "In-Game Purchases" label. Rockstar had previously stated that the game would not have microtransactions, and the relationship between this new label and their earlier statement remains unclear.
The listed rating descriptors include blood and violence, mature humor, nudity, strong language, sexual content, and use of alcohol. The "In-Game Purchases" label does not specify which content it involves.
GameRant suggests two possibilities: the label might relate to paid content in the Deluxe Edition that isn't included in the Standard Edition, or it could point to future purchases in the online mode. These are still speculations and cannot confirm that the game will include microtransactions or that the label corresponds to a specific type of payment method.
GTA 6 is scheduled for release on November 19. The online mode has not yet been fully showcased, and further clarification is needed regarding the scope of the label and content differences between versions.