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The Essential StoreKit Companion

StoreKit is the Apple framework for making In-App Purchases. It's pretty good, but it has a few rough edges.

CargoBay smooths out those rough parts by providing:

  • Block-based interface for requesting product information
  • Ability to request product information for identifiers asynchronously from a remote web service
  • Block-based callbacks for payment queue observation delegate methods
  • One-step receipt verification


Product Requests

NSArray *identifiers = @[

[[CargoBay sharedManager] productsWithIdentifiers:[NSSet setWithArray:identifiers]
success:^(NSArray *products, NSArray *invalidIdentifiers) {
  NSLog(@"Products: %@", products);
  NSLog(@"Invalid Identifiers: %@", invalidIdentifiers);
} failure:^(NSError *error) {
  NSLog(@"Error: %@", error);

Getting Product Identifiers From Server

NSURL *URL = [NSURL URLWithString:@""];
[[CargoBay sharedManager] productsWithURLRequest:[NSURLRequest requestWithURL:URL]
success:^(NSArray *products, NSArray *invalidIdentifiers) {
  // ...
} failure:^(NSError *error) {
  // ...

Payment Queue Observation


- (void)application:(UIApplication *)application didFinishLoadingWithOptions:(NSDictionary *)options {
  [[CargoBay sharedManager] setPaymentQueueUpdatedTransactionsBlock:^(SKPaymentQueue *queue, NSArray *transactions) {
    NSLog(@"Updated Transactions: %@", transactions);

  [[SKPaymentQueue defaultQueue] addTransactionObserver:[CargoBay sharedManager]];

  // ...

Verifying Receipts

[[CargoBay sharedManager] verifyTransaction:(SKPaymentTransaction *) success:^(NSDictionary *receipt) {
  NSLog(@"Receipt: %@", receipt);
} failure:^(NSError *error) {
    NSLog(@"Error %d (%@)", [error code], [error localizedDescription]);


Mattt Thompson


CargoBay is available under the MIT license. See the LICENSE file for more info.

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