Get in-app purchases right the first time

Purchases.shared.purchase(package: package) {
    (transaction, customerInfo, error, userCancelled) in
  let entitlement = customerInfo.entitlements["your_entitlement_id"]
  if entitlement?.isActive == true {
    // Unlock that great "pro" content              
  }
}

[[RCPurchases sharedPurchases] purchasePackage:package
                                withCompletion:^(RCStoreTransaction *transaction,
                                                RCCustomerInfo *customerInfo,
                                                NSError *error,
                                                BOOL cancelled) {
  if (customerInfo.entitlements[@"your_entitlement_id"].isActive) {
    // Unlock that great "pro" content
  }
}];

Purchases.sharedInstance.purchasePackage(
  this,
  aPackage,
  onError = { error, userCancelled -> /* No purchase */ },
  onSuccess = { product, customerInfo ->
    val entitlement = customerInfo.entitlements["my_entitlement_identifier"]
    if (entitlement?.isActive == true) {
    // Unlock that great "pro" content
  }
})

Purchases.getSharedInstance().purchasePackage(
  this,
  aPackage,
  new MakePurchaseListener() {
    @Override
    public void onCompleted(
      @NonNull Purchase purchase,
      @NonNull CustomerInfo customerInfo
    ) {
      if (customerInfo.getEntitlements().get("my_entitlement_identifier").isActive()) {
        // Unlock that great "pro" content
      }
    }

    @Override
    public void onError(@NonNull PurchasesError error, Boolean userCancelled) {
      // No purchase
    }
  }
);

try {
 PurchaserInfo purchaserInfo = await Purchases.purchasePackage(
  package
 );
 if (purchaserInfo.entitlements.all["my_entitlement_identifier"]
  .isActive) {
  // Unlock that great "pro" content
 }
} on PlatformException catch (e) {
 /* No purchase */ 
}

try {
 const {
  purchaserInfo,
  productIdentifier
 } = await Purchases.purchasePackage(package);
 if (typeof purchaserInfo.entitlements.active.pro !== "undefined") {
  // Unlock that great "pro" content
 }
} catch (e) {
 /* No purchase */ 
}

Purchases.purchasePackage(package, ({ productIdentifier, purchaserInfo }) => {
    if (typeof purchaserInfo.entitlements.active.my_entitlement_identifier !== "undefined") {
      // Unlock that great "pro" content
    }
  },
  ({error, userCancelled}) => {
    // Error making purchase
  }
);

// Note: if you are using purchaseProduct to purchase Android In-app products, an optional third parameter needs to be provided when calling purchaseProduct. You can use the package system to avoid this.

Purchases.purchaseProduct("product_id", ({ productIdentifier, purchaserInfo }) => {
}, ({error, userCancelled}) => {
    // Error making purchase
}, null, Purchases.PURCHASE_TYPE.INAPP);

Purchases purchases = GetComponent<Purchases>();
purchases.PurchasePackage(package, (productIdentifier, purchaserInfo, userCancelled, error) =>
{
  if (purchaserInfo.Entitlements.Active.ContainsKey("my_entitlement_identifier")) {
    // Unlock that great "pro" content
  }
});