Add method to get collection by handle.

Mobile Buy SDK/Mobile Buy SDK/Data/BUYClient+Storefront.h

@@ -78,6 +78,14 @@ typedef NS_ENUM(NSUInteger, BUYCollectionSort) {
 typedef void (^BUYDataShopBlock)(BUYShop * _Nullable shop, NSError * _Nullable error);
 
 /**
+ *  Return block containing a BUYCollection object and/or an NSError
+ *
+ *  @param collection  A BUYCollection object.
+ *  @param error       Optional NSError
+ */
+typedef void (^BUYDataCollectionBlock)(BUYCollection* _Nullable collection, NSError * _Nullable error);
+
+/**
  *  Return block containing a list of BUYCollection objects and/or an NSError
  *
  *  @param collections An array of BUYCollection objects
@@ -191,6 +199,16 @@ typedef void (^BUYDataTagsListBlock)(NSArray <NSString *> * _Nullable tags, NSUI
 - (NSOperation *)getProductTagsPage:(NSUInteger)page completion:(BUYDataTagsListBlock)block;
 
 /**
+ *  Fetch a single collection by the handle of the collection.
+ *
+ *  @param handle Collection handle
+ *  @param block  (^BUYDataCollectionBlock)(BUYCollection* _Nullable collection, NSError * _Nullable error)
+ *
+ *  @return The associated operation.
+ */
+- (NSOperation *)getCollectionByHandle:(NSString *)handle completion:(BUYDataCollectionBlock)block;
+
+/**
  *  Fetches collections based off page
  *
  *  @param page  Index of the page requested

Mobile Buy SDK/Mobile Buy SDK/Data/BUYClient+Storefront.m

@@ -141,6 +141,21 @@ static NSString * const BUYCollectionsKey = @"collection_listings";
 	}];
 }
 
+- (NSOperation *)getCollectionByHandle:(NSString *)handle completion:(BUYDataCollectionBlock)block
+{
+	NSURL *url = [self urlForCollectionListingsWithParameters:@{
+																@"handle" : handle
+																}];
+	
+	return [self getRequestForURL:url completionHandler:^(NSDictionary *json, NSHTTPURLResponse *response, NSError *error) {
+		BUYCollection *collection = nil;
+		if (json && !error) {
+			collection = [self.modelManager buy_objectWithEntityName:[BUYCollection entityName] JSONDictionary:json];
+		}
+		block(collection, error);
+	}];
+}
+
 - (NSOperation *)getCollectionsPage:(NSUInteger)page completion:(BUYDataCollectionsListBlock)block
 {
 	NSURL *url  = [self urlForCollectionListingsWithParameters:@{