Firstly I bought yearly subscription then I downgrade it to monthly subscription (proration mode used deferred), now this time when I buy monthly subscription, it i.e onPurchasesUpdated callback method gives me purchase data of yearly subscription again instead of giving new purchase data i.e of monthly purchase, why it do so?
Found the issue and fixed , it was related with DEFERRED proration mode, I changed it to WITHOUT_PRORATION and then it worked fine, it (onPurchasesUpdate) gave the latest purchases data instead of the old one