Implement BUYCheckoutOperation (incomplete).

Mobile Buy SDK/Mobile Buy SDK.xcodeproj/project.pbxproj

@@ -361,6 +361,10 @@
 		9A0B0C831CEB981C0037D68F /* BUYClient+RoutingTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A0B0C821CEB981C0037D68F /* BUYClient+RoutingTests.m */; };
 		9A0B0CA21CECC1BC0037D68F /* BUYClient+Checkout.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A0B0C711CEB52B90037D68F /* BUYClient+Checkout.m */; };
 		9A0B0CA31CECC1BD0037D68F /* BUYClient+Checkout.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A0B0C711CEB52B90037D68F /* BUYClient+Checkout.m */; };
+		9A0B0CA71CED0A860037D68F /* BUYCheckoutOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 9A0B0CA51CED0A860037D68F /* BUYCheckoutOperation.h */; };
+		9A0B0CA81CED0A860037D68F /* BUYCheckoutOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 9A0B0CA51CED0A860037D68F /* BUYCheckoutOperation.h */; };
+		9A0B0CA91CED0A860037D68F /* BUYCheckoutOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A0B0CA61CED0A860037D68F /* BUYCheckoutOperation.m */; };
+		9A0B0CAA1CED0A860037D68F /* BUYCheckoutOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A0B0CA61CED0A860037D68F /* BUYCheckoutOperation.m */; };
 		9A102D1B1CDD1F960026CC43 /* BUYErrorTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A102D1A1CDD1F960026CC43 /* BUYErrorTests.m */; };
 		9A102D1E1CDD25980026CC43 /* BUYOptionValueTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A102D1D1CDD25980026CC43 /* BUYOptionValueTests.m */; };
 		9A47CEFD1CE39F6000A6D5BA /* BUYCreditCardToken.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A47CEFB1CE39F5B00A6D5BA /* BUYCreditCardToken.m */; };
@@ -654,6 +658,8 @@
 		9A0B0C761CEB5BBD0037D68F /* BUYAuthenticatedResponse.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BUYAuthenticatedResponse.h; sourceTree = "<group>"; };
 		9A0B0C771CEB5BBD0037D68F /* BUYAuthenticatedResponse.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYAuthenticatedResponse.m; sourceTree = "<group>"; };
 		9A0B0C821CEB981C0037D68F /* BUYClient+RoutingTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "BUYClient+RoutingTests.m"; sourceTree = "<group>"; };
+		9A0B0CA51CED0A860037D68F /* BUYCheckoutOperation.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BUYCheckoutOperation.h; sourceTree = "<group>"; };
+		9A0B0CA61CED0A860037D68F /* BUYCheckoutOperation.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYCheckoutOperation.m; sourceTree = "<group>"; };
 		9A102D1A1CDD1F960026CC43 /* BUYErrorTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYErrorTests.m; sourceTree = "<group>"; };
 		9A102D1D1CDD25980026CC43 /* BUYOptionValueTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYOptionValueTests.m; sourceTree = "<group>"; };
 		9A47CEF81CE39EC200A6D5BA /* BUYPaymentToken.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BUYPaymentToken.h; sourceTree = "<group>"; };
@@ -1014,6 +1020,15 @@
 			name = "Operation Tests";
 			sourceTree = "<group>";
 		};
+		9A0B0CAB1CEDDBD80037D68F /* Aggregate */ = {
+			isa = PBXGroup;
+			children = (
+				9A0B0CA51CED0A860037D68F /* BUYCheckoutOperation.h */,
+				9A0B0CA61CED0A860037D68F /* BUYCheckoutOperation.m */,
+			);
+			name = Aggregate;
+			sourceTree = "<group>";
+		};
 		9A102D1C1CDD257D0026CC43 /* Models Tests */ = {
 			isa = PBXGroup;
 			children = (
@@ -1061,6 +1076,7 @@
 				9A585C051CE6440B001F20F0 /* BUYOperation.m */,
 				9A585C111CE65811001F20F0 /* BUYRequestOperation.h */,
 				9A585C121CE65811001F20F0 /* BUYRequestOperation.m */,
+				9A0B0CAB1CEDDBD80037D68F /* Aggregate */,
 			);
 			path = Operations;
 			sourceTree = "<group>";
@@ -1210,6 +1226,7 @@
 				84DD12A91CC63FE600A2442D /* _BUYOrder.h in Headers */,
 				84DD129F1CC63FE600A2442D /* _BUYCustomer.h in Headers */,
 				9A0B0C671CEA703E0037D68F /* BUYClient+Routing.h in Headers */,
+				9A0B0CA81CED0A860037D68F /* BUYCheckoutOperation.h in Headers */,
 				84DD12991CC63FE600A2442D /* _BUYCart.h in Headers */,
 				84DD129D1CC63FE600A2442D /* _BUYCollection.h in Headers */,
 				9A0B0C731CEB52B90037D68F /* BUYClient+Checkout.h in Headers */,
@@ -1374,6 +1391,7 @@
 				84D9154B1CC03F1600D334FB /* BUYManagedObject.h in Headers */,
 				84DD12CD1CC6401400A2442D /* BUYCustomer.h in Headers */,
 				BE9A645D1B503CE30033E558 /* BUYObject.h in Headers */,
+				9A0B0CA71CED0A860037D68F /* BUYCheckoutOperation.h in Headers */,
 				BE9A646E1B503D1E0033E558 /* BUYRuntime.h in Headers */,
 				BEB74A901B55A3D00005A300 /* BUYCollection.h in Headers */,
 				84D915431CC0359700D334FB /* BUYObserver.h in Headers */,
@@ -1611,6 +1629,7 @@
 				9A0B0CA21CECC1BC0037D68F /* BUYClient+Checkout.m in Sources */,
 				841ADE0E1CB6C942000004B0 /* NSDecimalNumber+BUYAdditions.m in Sources */,
 				84DD12AE1CC63FE600A2442D /* _BUYProductVariant.m in Sources */,
+				9A0B0CAA1CED0A860037D68F /* BUYCheckoutOperation.m in Sources */,
 				84B0A7211CDD261100253EB0 /* BUYSerializable.m in Sources */,
 				9A47CEFE1CE39F6100A6D5BA /* BUYCreditCardToken.m in Sources */,
 				9A0B0C7B1CEB5BBD0037D68F /* BUYAuthenticatedResponse.m in Sources */,
@@ -1752,6 +1771,7 @@
 				9A0B0CA31CECC1BD0037D68F /* BUYClient+Checkout.m in Sources */,
 				841ADE0D1CB6C942000004B0 /* NSDecimalNumber+BUYAdditions.m in Sources */,
 				84DD12961CC63FE600A2442D /* _BUYProductVariant.m in Sources */,
+				9A0B0CA91CED0A860037D68F /* BUYCheckoutOperation.m in Sources */,
 				84B0A7201CDD261100253EB0 /* BUYSerializable.m in Sources */,
 				9A47CEFD1CE39F6000A6D5BA /* BUYCreditCardToken.m in Sources */,
 				9A0B0C7A1CEB5BBD0037D68F /* BUYAuthenticatedResponse.m in Sources */,

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

@@ -153,9 +153,9 @@ typedef void (^BUYDataGiftCardBlock)(BUYGiftCard * _Nullable giftCard, NSError *
  *  @param paymentToken  Opaque payment token object. May be nil if the total checkout amount is equal to $0.00
  *  @param block         (^BUYDataCheckoutBlock)(BUYCheckout *checkout, NSError *error);
  *
- *  @return The associated BUYRequestOperation
+ *  @return The associated BUYOperation
  */
-- (BUYRequestOperation *)completeCheckout:(BUYCheckout *)checkout paymentToken:(_Nullable id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block;
+- (BUYOperation *)completeCheckout:(BUYCheckout *)checkout paymentToken:(_Nullable id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block;
 
 /**
  *  Retrieve the status of a BUYCheckout. This checks the status of the current payment processing job for the provided checkout.

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

@@ -27,6 +27,7 @@
 #import "BUYClient+Checkout.h"
 #import "BUYClient+Internal.h"
 #import "BUYClient+Routing.h"
+#import "BUYCheckoutOperation.h"
 #import "BUYAddress.h"
 #import "BUYCheckout.h"
 #import "BUYGiftCard.h"
@@ -41,6 +42,8 @@
 
 @implementation BUYClient (Checkout)
 
+#pragma mark - API -
+
 - (void)handleCheckoutResponse:(NSDictionary *)json error:(NSError *)error block:(BUYDataCheckoutBlock)block
 {
 	BUYCheckout *checkout = nil;
@@ -137,10 +140,15 @@
 
 - (BUYRequestOperation *)getCheckout:(BUYCheckout *)checkout completion:(BUYDataCheckoutBlock)block
 {
+	return [self getCheckout:checkout start:YES completion:block];
+}
+
+- (BUYRequestOperation *)getCheckout:(BUYCheckout *)checkout start:(BOOL)start completion:(BUYDataCheckoutBlock)block
+{
 	BUYAssertCheckout(checkout);
 	
 	NSURL *route = [self urlForCheckoutsWithToken:checkout.token];
-	return [self getRequestForURL:route completionHandler:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
+	return [self getRequestForURL:route start:start completionHandler:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
 		[self handleCheckoutResponse:json error:error block:block];
 	}];
 }
@@ -155,7 +163,11 @@
 	}];
 }
 
-- (BUYRequestOperation*)completeCheckout:(BUYCheckout *)checkout paymentToken:(id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block
+- (BUYOperation *)completeCheckout:(BUYCheckout *)checkout paymentToken:(id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block {
+	return [[BUYCheckoutOperation alloc] initWithClient:self checkout:checkout token:paymentToken completion:block];
+}
+
+- (BUYRequestOperation *)beginCheckout:(BUYCheckout *)checkout paymentToken:(id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block
 {
 	BUYAssertCheckout(checkout);
 	
@@ -164,7 +176,7 @@
 	BUYAssert(paymentToken || isFree, @"Failed to complete checkout. Checkout must have a payment token or have a payment value equal to $0.00");
 	
 	NSURL *route = [self urlForCheckoutsCompletionWithToken:checkout.token];
-	return [self postRequestForURL:route object:[paymentToken JSONDictionary] completionHandler:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
+	return [self postRequestForURL:route object:[paymentToken JSONDictionary] start:NO completionHandler:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
 		[self handleCheckoutResponse:json error:error block:block];
 	}];
 }
@@ -173,7 +185,7 @@
 {
 	BUYAssertCheckout(checkout);
 	
-	return [self getCompletionStatusOfCheckoutToken:checkout.token completion:block];
+	return [self getCompletionStatusOfCheckoutToken:checkout.token start:YES completion:block];
 }
 
 - (BUYRequestOperation *)getCompletionStatusOfCheckoutURL:(NSURL *)url completion:(BUYDataStatusBlock)block
@@ -190,19 +202,19 @@
 	
 	BUYAssert(token, @"Failed to get completion status of checkout. Checkout URL must have a valid token associated with it.");
 	
-	return [self getCompletionStatusOfCheckoutToken:token completion:block];
+	return [self getCompletionStatusOfCheckoutToken:token start:YES completion:block];
 }
 
-- (BUYRequestOperation *)getCompletionStatusOfCheckoutToken:(NSString *)token completion:(BUYDataStatusBlock)block
+- (BUYRequestOperation *)getCompletionStatusOfCheckoutToken:(NSString *)token start:(BOOL)start completion:(BUYDataStatusBlock)block
 {
 	NSURL *route = [self urlForCheckoutsProcessingWithToken:token];
-	return [self getRequestForURL:route completionHandler:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
+	return [self getRequestForURL:route start:start completionHandler:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
 		NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
 		block([self statusForStatusCode:statusCode error:error], error);
 	}];
 }
 
-#pragma mark - Shipping Rates
+#pragma mark - Shipping Rates -
 
 - (BUYRequestOperation *)getShippingRatesForCheckout:(BUYCheckout *)checkout completion:(BUYDataShippingRatesBlock)block
 {
@@ -223,7 +235,7 @@
 	}];
 }
 
-#pragma mark - Payments
+#pragma mark - Payments -
 
 - (BUYRequestOperation *)storeCreditCard:(BUYCreditCard *)creditCard checkout:(BUYCheckout *)checkout completion:(BUYDataCreditCardBlock)completion
 {

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

@@ -31,14 +31,23 @@ static NSString * const BUYShopifyErrorDomain = @"shopify";
 static NSString * const BUYClientVersionString = @"1.3";
 static NSString * const BUYClientCustomerAccessToken = @"X-Shopify-Customer-Access-Token";
 
+typedef void (^BUYClientRequestJSONCompletion)(NSDictionary *json, NSURLResponse *response, NSError *error);
+
 @interface BUYClient (Internal)
 
-- (BUYRequestOperation *)getRequestForURL:(NSURL *)url    completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler;
-- (BUYRequestOperation *)deleteRequestForURL:(NSURL *)url completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler;
+- (BUYRequestOperation *)getRequestForURL:(NSURL *)url    completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+- (BUYRequestOperation *)deleteRequestForURL:(NSURL *)url completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+
+- (BUYRequestOperation *)postRequestForURL:(NSURL *)url  object:(id <BUYSerializable>)object completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+- (BUYRequestOperation *)putRequestForURL:(NSURL *)url   object:(id<BUYSerializable>)object  completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+- (BUYRequestOperation *)patchRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+
+- (BUYRequestOperation *)getRequestForURL:(NSURL *)url    start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+- (BUYRequestOperation *)deleteRequestForURL:(NSURL *)url start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
 
-- (BUYRequestOperation *)postRequestForURL:(NSURL *)url  object:(id <BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler;
-- (BUYRequestOperation *)putRequestForURL:(NSURL *)url   object:(id<BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler;
-- (BUYRequestOperation *)patchRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler;
+- (BUYRequestOperation *)postRequestForURL:(NSURL *)url  object:(id <BUYSerializable>)object start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+- (BUYRequestOperation *)putRequestForURL:(NSURL *)url   object:(id<BUYSerializable>)object  start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
+- (BUYRequestOperation *)patchRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
 
 - (BUYStatus)statusForStatusCode:(NSUInteger)statusCode error:(NSError *)error;
 - (NSError *)errorFromJSON:(NSDictionary *)json response:(NSURLResponse *)response;

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

@@ -27,6 +27,7 @@
 @import Foundation;
 
 @class BUYModelManager;
+@class BUYOperation;
 @class BUYRequestOperation;
 
 /**

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

@@ -117,31 +117,58 @@ static NSString * const BUYClientJSONMimeType = @"application/json";
 	return nil;
 }
 
+#pragma mark - Auto Starting Convenience Requests
+
+- (BUYRequestOperation *)getRequestForURL:(NSURL *)url completionHandler:(BUYClientRequestJSONCompletion)completionHandler
+{
+	return [self getRequestForURL:url start:YES completionHandler:completionHandler];
+}
+
+- (BUYRequestOperation *)postRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object completionHandler:(BUYClientRequestJSONCompletion)completionHandler
+{
+	return [self postRequestForURL:url object:object start:YES completionHandler:completionHandler];
+}
+
+- (BUYRequestOperation *)putRequestForURL:(NSURL *)url object:(id<BUYSerializable>)object completionHandler:(BUYClientRequestJSONCompletion)completionHandler
+{
+	return [self putRequestForURL:url object:object start:YES completionHandler:completionHandler];
+}
+
+- (BUYRequestOperation *)patchRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object completionHandler:(BUYClientRequestJSONCompletion)completionHandler
+{
+	return [self patchRequestForURL:url object:object start:YES completionHandler:completionHandler];
+}
+
+- (BUYRequestOperation *)deleteRequestForURL:(NSURL *)url completionHandler:(BUYClientRequestJSONCompletion)completionHandler
+{
+	return [self deleteRequestForURL:url start:YES completionHandler:completionHandler];
+}
+
 #pragma mark - Convenience Requests
 
-- (BUYRequestOperation *)getRequestForURL:(NSURL *)url completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler
+- (BUYRequestOperation *)getRequestForURL:(NSURL *)url start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler
 {
-	return [self requestForURL:url method:@"GET" object:nil completionHandler:completionHandler];
+	return [self requestForURL:url method:@"GET" object:nil start:start completionHandler:completionHandler];
 }
 
-- (BUYRequestOperation *)postRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler
+- (BUYRequestOperation *)postRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler
 {
-	return [self requestForURL:url method:@"POST" object:object completionHandler:completionHandler];
+	return [self requestForURL:url method:@"POST" object:object start:start completionHandler:completionHandler];
 }
 
-- (BUYRequestOperation *)putRequestForURL:(NSURL *)url object:(id<BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler
+- (BUYRequestOperation *)putRequestForURL:(NSURL *)url object:(id<BUYSerializable>)object start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler
 {
-	return [self requestForURL:url method:@"PUT" object:object completionHandler:completionHandler];
+	return [self requestForURL:url method:@"PUT" object:object start:start completionHandler:completionHandler];
 }
 
-- (BUYRequestOperation *)patchRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler
+- (BUYRequestOperation *)patchRequestForURL:(NSURL *)url object:(id <BUYSerializable>)object start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler
 {
-	return [self requestForURL:url method:@"PATCH" object:object completionHandler:completionHandler];
+	return [self requestForURL:url method:@"PATCH" object:object start:start completionHandler:completionHandler];
 }
 
-- (BUYRequestOperation *)deleteRequestForURL:(NSURL *)url completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler
+- (BUYRequestOperation *)deleteRequestForURL:(NSURL *)url start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler
 {
-	return [self requestForURL:url method:@"DELETE" object:nil completionHandler:completionHandler];
+	return [self requestForURL:url method:@"DELETE" object:nil start:start completionHandler:completionHandler];
 }
 
 #pragma mark - Generic Requests
@@ -157,7 +184,12 @@ static NSString * const BUYClientJSONMimeType = @"application/json";
 	return [NSString stringWithFormat:@"%@ %@", @"Basic", [data base64EncodedStringWithOptions:0]];
 }
 
-- (BUYRequestOperation *)requestForURL:(NSURL *)url method:(NSString *)method object:(id <BUYSerializable>)object completionHandler:(void (^)(NSDictionary *json, NSURLResponse *response, NSError *error))completionHandler
+- (BUYRequestOperation *)requestForURL:(NSURL *)url method:(NSString *)method object:(id <BUYSerializable>)object completionHandler:(BUYClientRequestJSONCompletion)completionHandler
+{
+	return [self requestForURL:url method:method object:object start:YES completionHandler:completionHandler];
+}
+
+- (BUYRequestOperation *)requestForURL:(NSURL *)url method:(NSString *)method object:(id <BUYSerializable>)object start:(BOOL)start completionHandler:(BUYClientRequestJSONCompletion)completionHandler
 {
 	NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
 	if (object) {
@@ -180,7 +212,9 @@ static NSString * const BUYClientJSONMimeType = @"application/json";
 		}];
 	}];
 	
+	if (start) {
 		[self startTask:operation];
+	}
 	return operation;
 }
 

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYCheckoutOperation.h

+//
+//  BUYCheckoutOperation.h
+//  Mobile Buy SDK
+//
+//  Created by Shopify.
+//  Copyright (c) 2015 Shopify Inc. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#import "BUYOperation.h"
+NS_ASSUME_NONNULL_BEGIN
+
+@class BUYClient;
+@class BUYCheckout;
+
+@protocol BUYPaymentToken;
+
+typedef void (^BUYCheckoutOperationCompletion)(BUYCheckout * _Nullable checkout, NSError * _Nullable error);
+
+@interface BUYCheckoutOperation : BUYOperation
+
+@property (strong, nonatomic, readonly, nonnull) BUYClient *client;
+
++ (instancetype)operationWithClient:(BUYClient *)client checkout:(BUYCheckout *)checkout token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion;
+- (instancetype)initWithClient:(BUYClient *)client checkout:(BUYCheckout *)checkout token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion;
+
+@end
+
+NS_ASSUME_NONNULL_END

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYCheckoutOperation.m

+//
+//  BUYCheckoutOperation.m
+//  Mobile Buy SDK
+//
+//  Created by Shopify.
+//  Copyright (c) 2015 Shopify Inc. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#import "BUYCheckoutOperation.h"
+#import "BUYClient+Checkout.h"
+#import "BUYPaymentToken.h"
+#import "BUYCheckout.h"
+#import "BUYRequestOperation.h"
+
+@interface BUYClient (PrivateCheckout)
+
+- (BUYRequestOperation *)beginCheckout:(BUYCheckout *)checkout paymentToken:(id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block;
+- (BUYRequestOperation *)getCompletionStatusOfCheckoutToken:(NSString *)token start:(BOOL)start completion:(BUYDataStatusBlock)block;
+- (BUYRequestOperation *)getCheckout:(BUYCheckout *)checkout start:(BOOL)start completion:(BUYDataCheckoutBlock)block;
+
+@end
+
+@interface BUYCheckoutOperation ()
+
+@property (strong, nonatomic, readonly) BUYCheckout *checkout;
+@property (strong, nonatomic, readonly) id<BUYPaymentToken> token;
+@property (strong, nonatomic, readonly) BUYCheckoutOperationCompletion completion;
+
+@property (strong, nonatomic, readonly) NSArray *operations;
+
+@end
+
+@implementation BUYCheckoutOperation
+
+#pragma mark - Init -
+
++ (instancetype)operationWithClient:(BUYClient *)client checkout:(BUYCheckout *)checkout token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion
+{
+	return [[[self class] alloc] initWithClient:client checkout:checkout token:token completion:completion];
+}
+
+- (instancetype)initWithClient:(BUYClient *)client checkout:(BUYCheckout *)checkout token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion
+{
+	self = [super init];
+	if (self) {
+		_client     = client;
+		_checkout   = checkout;
+		_token      = token;
+		_completion = completion;
+	}
+	return self;
+}
+
+#pragma mark - Finishing -
+
+- (void)finishWithCheckout:(BUYCheckout *)checkout
+{
+	[self finishExecution];
+	self.completion(checkout, nil);
+}
+
+- (void)finishWithError:(NSError *)error
+{
+	[self finishExecution];
+	self.completion(nil, error);
+}
+
+#pragma mark - Execution -
+
+- (void)startExecution
+{
+	[super startExecution];
+	
+	__weak typeof(self) weakSelf = self;
+	
+	BUYRequestOperation *beginOperation = [self.client beginCheckout:self.checkout paymentToken:self.token completion:^(BUYCheckout *checkout, NSError *error) {
+		if (weakSelf.isCancelled || !checkout) {
+			[weakSelf cancel];
+			return;
+		}
+	}];
+	
+	BUYRequestOperation *pollingOperation = [self.client getCompletionStatusOfCheckoutToken:self.checkout.token start:NO completion:^(BUYStatus status, NSError *error) {
+		if (weakSelf.isCancelled || status != BUYStatusComplete) {
+			[weakSelf cancel];
+			return;
+		}
+	}];
+	pollingOperation.pollingHandler = ^BOOL (NSDictionary *json, NSHTTPURLResponse *response, NSError *error) {
+		return response.statusCode == BUYStatusProcessing;
+	};
+	
+	BUYRequestOperation *getOperation = [self.client getCheckout:self.checkout completion:^(BUYCheckout *checkout, NSError *error) {
+		if (weakSelf.isCancelled || !checkout) {
+			[weakSelf cancel];
+			return;
+		}
+	}];
+	
+	
+	[self locked:^{
+		_operations = @[beginOperation, pollingOperation, getOperation];
+	}];
+	[self.client.requestQueue addOperations:self.operations waitUntilFinished:NO];
+}
+
+- (void)cancelExecution
+{
+	[super cancelExecution];
+	
+	for (NSOperation *operation in self.operations) {
+		[operation cancel];
+	}
+}
+
+@end