Jetpack Compose boilerplate that ships on the Play Store

// Play Billing - native Android purchases
@HiltViewModel
class PaywallViewModel @Inject constructor(
    private val billingClient: BillingClient,
    private val supabaseClient: SupabaseClient
) : ViewModel() {

    val products = mutableStateListOf<ProductDetails>()

    init {
        viewModelScope.launch {
            val result = billingClient.queryProductDetails(
                QueryProductDetailsParams.newBuilder()
                    .setProductList(QUERY_LIST)
                    .build()
            )
            products.addAll(result.productDetailsList)
        }
    }

    fun purchase(activity: Activity, product: ProductDetails) {
        val flowParams = BillingFlowParams.newBuilder()
            .setProductDetailsParamsList(listOf(
                BillingFlowParams.ProductDetailsParams
                    .newBuilder()
                    .setProductDetails(product)
                    .build()
            ))
            .build()
        billingClient.launchBillingFlow(activity, flowParams)
    }
}