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NameDescription
ChargeFullPriceThe new plan takes effect immediately, and the user is charged full price of new plan and is given a full billing cycle of subscription, plus remaining prorated time from the old plan.
ChargeProratedPriceThe new plan takes effect immediately, and the billing cycle remains the same.
WithTimeProrationThe new plan takes effect immediately, and the remaining time will be prorated and credited to the user.
DeferredThe new purchase takes effect immediately, the new plan will take effect when the old item expires.
WithoutProrationThe new plan takes effect immediately, and the new price will be charged on next recurrence time.
Upgrading, downgrading, or changing a subscription on Google Play Store requires calling the updatePurchase function. See Google Play Documentation for more details. Use Qonversion SDK for upgrading, downgrading, or changing Google Play Store subscription: 
final QPurchaseOptions purchaseOptions = new QPurchaseOptions.Builder()
        .setOldProduct(oldProduct)
        .build();
Qonversion.getSharedInstance().purchase(this, product, purchaseOptions, new QonversionPurchaseCallback() {
    @Override
    public void onResult(@NonNull QPurchaseResult result) {
        if (result.isSuccessful()) {
            QEntitlement premium = result.getEntitlements().get("premium");
            if (premium != null && premium.isActive()) {
                // Grant user access to premium features
            }
        } else if (result.isCanceledByUser()) {
            // Handle canceled purchase
        } else if (result.isPending()) {
            // Handle pending purchase
        } else {
            // Handle errors
        }
    }
});
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