Max number of requests

[RBerntsen]

Hi @nufyoot (and everyone else).

I have inherited a solution with an integration to Campaign Monitor. The user can subscribe to multiple lists which results in a foreach loop like this:

                AuthenticationDetails authenticationDetails = new ApiKeyAuthenticationDetails(apiKey);

                foreach (var selectedListId in model.SelectedListIds)
                {
                    var subscriber = new Subscriber(authenticationDetails, selectedListId);

                    var customFieldsList = new List<SubscriberCustomField>
                    {
                        CreateSubscriberCustomField(FormConstants.Position, model.Position),
                        CreateSubscriberCustomField(FormConstants.PlaceOfWork, model.PlaceOfWork)
                    };

                    model.Name = model.FirstName + " " + model.LastName;

                    subscriber.Add(model.Email, model.Name, customFieldsList, true, ConsentToTrack.Yes);
                }

The first couple of submits goes fine but after some iterations it starts throwing a "429 too many requests". I can't see any headers in the response that tells me about a limit or anything. I wonder if there's a known limit of requests you can do in a certain time frame? I have been looking at the documentation but I don't see any regarding this issue and furthermore I can't see if this should have been structured differently.

[LancesCM]

Hi,

A 429 when adding a subscriber only occurs if you have added the same subscriber/email to your account in quick succession. In this case your process appears to add the same subscriber/email to many lists at once which is the same as adding the same email to your account in quick succession.

We strongly encourage the use of segmenting a list of subscribers to send a campaign; but if your workflow really needs it to work this way you can send the support team at Campaign Monitor an email and they can set your account to bypass this duplication check.

[RBerntsen]

Hi @LancesCM
Thanks for the quick reply. Can you give some pointers (e.g. documentation) to this? Sounds like it's structured incorrectly as of now? Basically we just need to add a user to a number of lists, depending on which they select.

Hi,
I got the same issue. Is it not a bit harsh to return a 429 when adding an email to your account in quick succession?
At least when there is no operation to add an email to multiple lists at the same time? It seems like a very basic request.

Is there a way, using this wrapper, to see for how long you are supposed to back off?

thanks!

[LancesCM]

What you are seeing is the result of an abuse prevention feature on our side. You can contact our Support team and specifically request to opt out of this feature. We do not allow that to be done through the API.

Just contacted support, and got a very quick reply!
It makes sense, and we will look into a workaround.
Support mentioned that if we want to turn the 429 errors off we will need captcha or a similar method to ensure fake subscribers are not added.

@LancesCM thank you very much for the quick response!