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POAmazon product search API: Not Working
 

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    <p>I am using Amazon web services to get the product Price.</p> <p>It was working fine but after the Amazon made the changes in the API in which associateTag becomes mandatory Parameter,it started giving an Error. So i put an associated tag in the request as: </p> <pre><code>tempQueryString =[NSString stringWithFormat:@"GET\necs.amazonaws.com\n/onca/xml\nAWSAccessKeyId=AKIAJ3A3LA5NYXWPSTGQ&amp;IdType=ASIN&amp;ItemId=B003VKR0J0&amp;MerchantId=Amazon&amp;AssociateTag=babyformu-20&amp;Operation=ItemLookup&amp;ResponseGroup=Large&amp;Service=AWSECommerceService&amp;SignatureVersion=2&amp;SignatureMethod=HmacSHA256&amp;Timestamp=%@T%@%@%@Z&amp;Version=2010-01-01",str2,hour,mint,s]; </code></pre> <p>Now it is Giving this error:<BR> <code>"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details."</code></p> <p>I did not make any changes in the signing method. Here it is:</p> <pre><code>NSString *key = @"9at/FN4mouFxnIV2SsoQTR4iO6x6AWVt2xFvEwmv"; // private key NSLog(@"current: %@ ",queryString); NSString *data = queryString; const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding]; const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding]; unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH]; CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC); NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC length:sizeof(cHMAC)]; hash = [HMAC base64Encoding]; NSLog(@"hash value11 == %@",hash); encodedString = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)hash, NULL, CFSTR(":/?#[]@!$&amp;’()*+,;="), kCFStringEncodingUTF8); </code></pre> <p>I am using this api to get the product detail:</p> <p><code>query=[NSString stringWithFormat:@"http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=AKIAJ3A3LA5NYXWPSTGQ&amp;IdType=ASIN&amp;ItemId=B003VKR0J0&amp;AssociateTag=babyformu-20&amp;MerchantId=Amazon&amp;Operation=ItemLookup&amp;ResponseGroup=Large&amp;Service=AWSECommerceService&amp;Timestamp=%@T%@:%@:%@Z&amp;Version=2009-03-31&amp;Signature=%@",str2,h,m,s,encodedString];</code></p> <p>Thanks in advance.</p>
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    1. COI'm getting the same issues today as well, now they require the associateTag, which I've put in I'm not bringing back any results... Very frustrating
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