inversemapping.m

[RKRequestDescriptor requestDescriptorWithMapping:[mappingProvider.orderConfirmationMapping inverseMapping]
                                      objectClass:[WTNOrderConfirmation class]
                                      rootKeyPath:@"confirmation"
                                           method:RKRequestMethodPOST];
                                           
// In the mapping provider
- (RKObjectMapping *)orderConfirmationMapping;
{
    if (!_orderConfirmationMapping) {
        _orderConfirmationMapping = [RKObjectMapping mappingForClass:[WTNOrderConfirmationResponse class]];
        [_orderConfirmationMapping addAttributeMappingsFromDictionary:@{
                                                                        @"return_url": @"returnURL",
                                                                        @"cancel_url": @"cancelURL"
                                                                        }];
    }
    
    return _orderConfirmationMapping;
}