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Version: 1.0

API Reference

IAPKit - In-App Purchase Made Simple

Complete reference for kmp-iap - A unified Kotlin Multiplatform API for implementing in-app purchases across iOS and Android platforms.

Available APIs​

🏪 Core Methods​

Essential methods for initializing connections, loading products, and processing purchases.

  • Connection Management: kmpIap.initConnection(), kmpIap.dispose()
  • Product Loading: kmpIap.requestProducts(), kmpIap.requestSubscriptions()
  • Purchase Processing: kmpIap.requestPurchase(), kmpIap.requestSubscription()
  • Transaction Management: kmpIap.finishTransaction(), kmpIap.acknowledgePurchase()

📱 Platform-Specific Methods​

Access iOS-specific and Android-specific features and capabilities.

  • iOS Features: Offer code redemption, subscription management, StoreKit 2 support
  • Android Features: Billing client state, pending purchases, deep links

🎧 State Management​

Real-time StateFlow for monitoring purchase events and connection states.

  • Purchase States: Success, errors, and state changes via StateFlow
  • Connection States: Store connection status updates
  • Product States: Available products and subscriptions

🔧 Types & Enums​

Comprehensive type definitions for type-safe development.

  • Data Classes: Platform-specific purchase and product models
  • Response Models: Products, purchases, and transaction data
  • Error Handling: Detailed error codes and messages

Quick Start​

import io.github.hyochan.kmpiap.*
import io.github.hyochan.kmpiap.types.*
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.*

class PurchaseManager {
    private val kmpIap = KmpIAP()
    private val scope = CoroutineScope(Dispatchers.Main)
    
    suspend fun initializePurchases() {
        // Initialize connection
        kmpIap.initConnection()
        
        // Set up state listeners
        scope.launch {
            kmpIap.purchaseUpdatedListener.collect { purchase ->
                handlePurchaseSuccess(purchase)
            }
        }
        
        scope.launch {
            kmpIap.purchaseErrorListener.collect { error ->
                handlePurchaseError(error)
            }
        }
    }
    
    suspend fun makePurchase(productId: String) {
        kmpIap.requestPurchase(
            UnifiedPurchaseRequest(
                sku = productId,
                quantity = 1,
                obfuscatedAccountIdAndroid = "user_id" // Optional
            )
        )
    }
}

Kotlin Multiplatform Support​

kmp-iap provides full type safety with Kotlin's strong typing and coroutines support for all methods, parameters, and return values.

Platform Compatibility​

  • iOS: 15.0+ with StoreKit 2
  • Android: API level 24+ with Google Play Billing Client v8

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