In-App Purchase で、プロダクトID が invalid になる場合の対処方法

たとえば下記のようなコードでプロダクト情報取得処理を行った場合に、

self.request = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:productId]];
self.request.delegate = self;
[self.request start];

プロダクト情報の取得が完了すると productsRequest:didReceiveResponse: メソッドが呼ばるわけですが、そこで下記のように「無効なプロダクトID」をチェックすると

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {

if ([response.invalidProductIdentifiers count] > 0) {
  // 無効なプロダクトIDあり 
}

みごとにinvalidになっている場合があります。

そんな場合のチェックリスト

Have you enabled In-App Purchases for your App ID?

Have you checked Cleared for Sale for your product?

Have you submitted (and optionally rejected) your application binary?

Does your project’s .plist Bundle ID match your App ID?

Have you generated and installed a new provisioning profile for the new App ID?

Have you configured your project to code sign using this new provisioning profile?

Are you building for iPhone OS 3.0 or above?

Are you using the full product ID when when making an SKProductRequest?

Have you waited several hours since adding your product to iTunes Connect?

Are your bank details active on iTunes Connect? (via Mark)

Have you tried deleting the app from your device and reinstalling?

Is your device jailbroken? If so, you need to revert the jailbreak for IAP to work. (via oh my god, Roman, and xfze)