Create NSError object when error object is returned from services

Sources/BranchSDK/BNCServerInterface.m

@@ -148,7 +148,24 @@ - (void)genericHTTPRequest:(NSURLRequest *)request retryNumber:(NSInteger)retryN
                         NSError *error = [NSError branchErrorWithCode:BNCVPNAdBlockerError];
                         [[BranchLogger shared] logError:[NSString stringWithFormat:@"Possible VPN Ad Blocker. Giving up on request with HTTP status code %ld. Underlying error: %@", (long)status, underlyingError] error:error];
                     } else {
-                        [[BranchLogger shared] logWarning: [NSString stringWithFormat:@"Giving up on request with HTTP status code %ld", (long)status] error:underlyingError];
+                        // If a network request is successful, the `data` field will be populated with the error response from the service
+                        // We have to create an NSError object here to pass down to callback.
+
+                        if(serverResponse.data && serverResponse.data[@"error"] != nil){
+                            id errorJson = serverResponse.data[@"error"];
+
+                            if(errorJson[@"message"] != nil){
+                                NSString *errorString = errorJson[@"message"];
+                                NSDictionary *userInfo = @{
+                                    NSLocalizedDescriptionKey: errorString,
+                                };
+                                underlyingError = [NSError errorWithDomain:[NSError bncErrorDomain]
+                                                                      code:[(errorJson[@"code"]) integerValue]
+                                                                  userInfo:userInfo];
+                            }
+                        }
+
+                        [[BranchLogger shared] logError: [NSString stringWithFormat:@"Giving up on request with HTTP status code %ld", (long)status] error:underlyingError];
                     }
                 }