Billing Integration

Billing Integration

AdManageKit provides a comprehensive billing integration module (admanagekit-billing) that simplifies Google Play Billing Library v9 implementation.

Quick Start

1. Add Dependency

implementation 'com.github.i2hammad.AdManageKit:ad-manage-kit-billing:v4.4.1'
implementation 'com.github.i2hammad.AdManageKit:ad-manage-kit-core:v4.4.1'

2. Define Products

val products = listOf(
    // Consumable (coins, gems)
    PurchaseItem("coins_100", TYPE_IAP.PURCHASE, PurchaseCategory.CONSUMABLE),

    // Lifetime premium (disables ads)
    PurchaseItem("lifetime", TYPE_IAP.PURCHASE, PurchaseCategory.LIFETIME_PREMIUM),

    // Remove ads only
    PurchaseItem("remove_ads", TYPE_IAP.PURCHASE, PurchaseCategory.REMOVE_ADS),

    // Subscription with trial
    PurchaseItem("premium_monthly", "free_trial", TYPE_IAP.SUBSCRIPTION)
)

3. Initialize

class MyApp : Application() {
    override fun onCreate() {
        super.onCreate()

        // Inject your build state (a library AAR always has BuildConfig.DEBUG = false).
        // In debug builds this registers a test product and routes purchase()/subscribe()
        // to the dev purchase bottom sheet instead of the real Play flow. Call BEFORE initBilling.
        AppPurchase.getInstance().setDebugMode(BuildConfig.DEBUG)

        AppPurchase.getInstance().initBilling(this, products)
    }
}

Acknowledgment is automatic. AppPurchase acknowledges every PURCHASED purchase before firing its callbacks, on both the new-purchase and restore paths — preventing Google Play's 3-day auto-refund of unacknowledged purchases. Only PurchaseState.PURCHASED grants entitlement (pending purchases do not). Consumables still require a manual consumePurchase(productId) after granting.

4. Make Purchases

// In-app purchase
AppPurchase.getInstance().purchase(activity, "remove_ads")

// Subscription
AppPurchase.getInstance().subscribe(activity, "premium_monthly")

5. Check Purchase Status

if (AppPurchase.getInstance().isPurchased()) {
    // User has premium (subscription, lifetime, or remove_ads)
}

6. Product Metadata (v3.4.1+)

val billing = AppPurchase.getInstance()
val name = billing.getProductName("premium_monthly")           // "Monthly Premium"
val description = billing.getProductDescription("premium_monthly")
val hasTrial = billing.hasFreeTrial("premium_monthly")         // true/false
val period = billing.getBillingPeriod("premium_monthly")       // "P1M"

7. Structured Offers (v3.5.7+)

For multi-offer subscriptions, use OfferInfo to read each offer's trial, introductory, and base phases without parsing ProductDetails manually:

val trial = billing.getTrialOffer("premium_yearly")
trial?.let {
    badge.text = "Free for ${it.trialPeriod}"        // "P7D"
    price.text = "${it.basePrice} / ${it.billingPeriod}"
}

val base = billing.getBaseOffer("premium_yearly")    // non-promo offer
val all  = billing.getOffers("premium_yearly")       // every offer

8. Buy a Specific Offer (v4.4.0+)

subscribe(activity, subsId) picks the offer for you (the configured trialId, else Play's last offer), so on a multi-offer product it can charge for the wrong plan. Pass the offer the user actually tapped:

val offers = billing.getOffers("premium_sub")
billing.subscribe(activity, offers[selectedIndex])   // exactly this plan

See Subscription Offers for offer lookup, price normalization, savings badges, trial eligibility, and one-time product offers.

9. Diagnose an Empty Paywall (v4.4.0+)

billing.setProductDetailsListener(object : ProductDetailsListener {
    override fun onProductDetailsLoaded(
        productType: String,
        loaded: List<ProductDetails>,
        unfetched: List<UnfetchedProduct>,
    ) {
        unfetched.forEach { Log.e("Billing", "${it.productId}: status ${it.statusCode}") }
    }
    override fun onProductDetailsFailed(productType: String, responseCode: Int, debugMessage: String?) { }
})

Register it before initBilling. Products land in unfetched when the id is misspelled, the product is inactive in Play Console, or the signed-in account cannot see the release track. isProductDetailsLoaded(id) and areAllProductDetailsLoaded() distinguish "missing" from "not loaded yet".

10. Fraud Prevention & EU Disclosure (v4.4.0+)

// Google-recommended hashed identifiers — never raw account data. Max 64 chars.
billing.setObfuscatedAccountId(sha256(userId))
billing.setObfuscatedProfileId(sha256(profileId))

// Required EU disclosure when prices are personalized per user.
billing.setOfferPersonalized(true)

Applied to every flow the library launches (purchase, subscribe, updateSubscription). Set after sign-in; pass null on sign-out.

Pages

• Purchase Categories - Product classification system
• Subscription Offers - Offers, trials, intro pricing, price comparison
• Consumable Products - Handling consumables with manual consumption
• Subscriptions - Subscription lifecycle management
• Subscription Upgrades - Upgrade/downgrade handling
• Purchase History - Tracking purchases with PurchaseHistoryListener
• PurchaseResult API - Full API reference for PurchaseResult
• Server Verification - Server-side purchase verification