我們在內購開發(fā)中亦鳞，購買成功后。要把這次交易的憑證發(fā)送給服務器棒坏。讓服務器去驗證這次交易是否真實。
拿到憑證的代碼：

NSURL* receiptURL = [[NSBundle mainBundle]appStoreReceiptURL];
//這里直接轉成base64是因為要發(fā)生給服務器遭笋。
NSString* receipt = [[NSData dataWithContentsOfURL:receiptURL]base64EncodedStringWithOptions:0];

但是發(fā)生過去后坝冕，發(fā)送一直憑證錯誤。導致浪費了瓦呼，三個小時時間在找問題上喂窟。后來测暗，對比發(fā)送前和發(fā)送后的憑證。發(fā)現(xiàn)磨澡！+變成了“ ”（空格）
研究后碗啄，這個特殊字符發(fā)送過去后，會發(fā)生改變稳摄。查資料后稚字，解決辦法如下：

NSURL* receiptURL = [[NSBundle mainBundle]appStoreReceiptURL];
    
NSString* receipt = [[NSData dataWithContentsOfURL:receiptURL]base64EncodedStringWithOptions:0];
receipt = [receipt stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:@"#%<>[\\]^`{|}\"]+"].invertedSet];

加一行代碼就??OK！

實際開發(fā)中厦酬，我們還可以自己去官網上先驗證一下憑證,然后再發(fā)生給服務器：

這里有個有趣現(xiàn)象胆描，就是不加上面那段代碼，發(fā)送給蘋果也是正常的仗阅，估計蘋果那里做了處理昌讲。把空格替換為+號了。

NSURL* receiptURL = [[NSBundle mainBundle]appStoreReceiptURL];
//這里直接轉成base64是因為要發(fā)生給服務器减噪。
NSString* receipt = [[NSData dataWithContentsOfURL:receiptURL]base64EncodedStringWithOptions:0];

~~~//======這里有個有趣現(xiàn)象短绸，就是不加上面那段代碼，發(fā)送給蘋果也是正常的筹裕，估計蘋果那里做了處理醋闭。把空格替換為+號了。======


          .....................................
              .....................................
NSError *error;
    NSDictionary *requestContents = @{
                                      @"receipt-data": receipt
                                      };
    NSData *requestData = [NSJSONSerialization dataWithJSONObject:requestContents
                                                          options:0
                                                            error:&error];
    
    if (!requestData) { /* ... Handle error ... */ }
    
    // Create a POST request with the receipt data.
    //正式環(huán)境請?zhí)鎿Q下面的地址為https://buy.itunes.apple.com/verifyReceipt
    NSURL *storeURL = [NSURL URLWithString:@"https://sandbox.itunes.apple.com/verifyReceipt"];
    NSMutableURLRequest *storeRequest = [NSMutableURLRequest requestWithURL:storeURL];
    [storeRequest setHTTPMethod:@"POST"];
    [storeRequest setHTTPBody:requestData];
    
    // Make a connection to the iTunes Store on a background queue.
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:storeRequest queue:queue
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
                               if (connectionError) {
                                   /* ... Handle error ... */
                               } else {
                                   NSError *error;
                                   NSDictionary *jsonResponse = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
                                   [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
                                   if (!jsonResponse) { /* ... Handle error ...*/ }
                                   /* ... Send a response back to the device ... */
                               }
                           }];