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[SDK guide] Added DMM billing support status to IAP v4, along with other updates

We are updating the Hive SDK IAP v4 guide. Apps run through DMM GAME PLAYER on Windows use DMM Points for payment. In this update, we added DMM billing support status to the supported features table and organized the related descriptions.

Key updates

  1. IAP v4
    • Added the DMM store to the Windows section of the IAP v4 supported features table
    • The DMM store supports single purchase, multiple purchases, purchase recovery, and payloads
    • The DMM store does not support cancellation/refund history, repurchase by refunded users, subscriptions, or auto-renewal subscriptions
  2. IAP v4 initialization
    • Changed the DMM description in Store information from "DMM Store" to "DMM billing"
    • Removed the reference to Prerequisites for DMM billing from the DMM description
  3. DMM Point balance inquiry
    • Updated the IAPV4.getBalanceInfo description: it is available only for DMM billing in the PC Windows environment, and calling it on another store returns NOT_SUPPORTED
  4. Product purchase
    • Removed the reference to Prerequisites for DMM billing from the DMM billing guidance