Remove unused file.

Mobile Buy SDK/Mobile Buy SDK/Models/Transient/BUYCheckout_Private.h

-//
-//  BUYCheckout_Private.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 "BUYCheckout.h"
-
-@interface BUYCheckout ()
-
-@property (nonatomic, copy) NSString *token;
-@property (nonatomic, copy) NSString *cartToken;
-@property (nonatomic, copy) NSNumber *orderId;
-@property (nonatomic, assign) BOOL requiresShipping;
-@property (nonatomic, assign) BOOL taxesIncluded;
-@property (nonatomic, copy) NSString *currency;
-@property (nonatomic, strong) NSString *paymentSessionId;
-@property (nonatomic, strong) NSNumber *reservationTimeLeft;
-@property (nonatomic, strong) NSDecimalNumber *paymentDue;
-@property (nonatomic, strong) NSURL *webCheckoutURL;
-@property (nonatomic, strong) NSURL *paymentURL;
-@property (nonatomic, strong) NSDecimalNumber *subtotalPrice;
-@property (nonatomic, strong) NSDecimalNumber *totalTax;
-@property (nonatomic, strong) NSDecimalNumber *totalPrice;
-@property (nonatomic, strong) NSURL *orderStatusURL;
-@property (nonatomic, strong) NSArray *giftCards;
-@property (nonatomic, copy) NSDate *createdAtDate;
-@property (nonatomic, copy) NSDate *updatedAtDate;
-@property (nonatomic, strong) BUYMaskedCreditCard *creditCard;
-@property (nonatomic, strong) BUYOrder *order;
-@property (nonatomic, copy) NSNumber *customerId;
-@property (nonatomic, strong) NSURL *privacyPolicyURL;
-@property (nonatomic, strong) NSURL *refundPolicyURL;
-@property (nonatomic, strong) NSURL *termsOfServiceURL;
-@property (nonatomic, copy) NSString *sourceName;
-@end