validateInviteCode

- (void)validateInviteCode:(NSString *)inviteCode
                   success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, id JSON))success
                   failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON))failure
{
    // Build parameters
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    [params setObject:inviteCode forKey:@"invite_code"];
    
    // Send request
    NSMutableURLRequest *req = [self requestWithMethod:@"POST" path:@"registration/family" parameters:params];
    self.parameterEncoding = AFJSONParameterEncoding; // MUST BE SET TO ENSURE CORRECT ENCODING
    
    [[AFJSONRequestOperation JSONRequestOperationWithRequest:req
        success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
            success(request, response, JSON);
        } failure:^(NSURLRequest *request , NSHTTPURLResponse *response , NSError *error, id JSON) {
            failure(request, response, error, JSON);
        }] start];
}