Add convenience to retrieve a specific item, by key, from account credentials.

Mobile Buy SDK/Mobile Buy SDK/Models/BUYAccountCredentials.h

@@ -48,6 +48,7 @@ OBJC_EXTERN NSString * const BUYAccountPasswordKey;
 
 + (BUYAccountCredentials *)credentialsWithItems:(NSArray<BUYAccountCredentialItem *> *)items;
 - (instancetype)initWithItems:(NSArray<BUYAccountCredentialItem *> *)items;
+- (BUYAccountCredentialItem *)credentialItemForKey:(NSString *)key;
 
 - (BUYAccountCredentials *)credentialsByAddingItems:(NSArray<BUYAccountCredentialItem *> *)items;
 

Mobile Buy SDK/Mobile Buy SDK/Models/BUYAccountCredentials.m

@@ -75,6 +75,11 @@ NSString * const BUYAccountPasswordKey             = @"password";
 	return self.credentialItems.allValues;
 }
 
+- (BUYAccountCredentialItem *)credentialItemForKey:(NSString *)key
+{
+	return _credentialItems[key];
+}
+
 - (NSUInteger)count
 {
 	return self.credentialItems.count;