How to switch form data submission from InfusionSoft API to HubSpot integration

Other Questions HubSpot
1

I’m working with a form in my CMS that currently sends data to InfusionSoft. Now I need to change it so it submits to HubSpot instead. I’ve been looking through the HubSpot API docs but can’t find clear examples for this kind of migration. Does anyone have experience with this or know where I can find good examples?

Here’s my current form model:

public class UserRegistrationHubspotModel {

    [StringLength(100), Required, Display(Name = "Given Name")]
    public string GivenName { get; set; }

    [StringLength(100), Required, Display(Name = "Family Name")]
    public string FamilyName { get; set; }

    [StringLength(75), Required, Display(Name = "Position Title")]
    public string PositionTitle { get; set; }

    [Display(Name = "subscribe_reports")]
    public bool Subscribe_Reports { get; set; }

    [Display(Name = "subscribe_analytics")]
    public bool Subscribe_Analytics { get; set; }
}

And here’s part of my controller that handles the submission:

[HttpPost, Themed]
public ActionResult Submit(UserRegistrationModel registrationData) {    
    // Preparing form data collection
    NameValueCollection submissionData = new NameValueCollection();
    submissionData["form_id"] = formIdentifier;
    submissionData["form_type"] = formTypeName;
    submissionData["api_version"] = apiVersion;
}

Any guidance would be really helpful!

2

I went through this exact migration about 6 months ago, and the main difference is that HubSpot expects JSON payloads rather than form data collections. You’ll want to target the /crm/v3/objects/contacts endpoint with a POST request. The property names need adjustment - HubSpot uses firstname, lastname, and jobtitle for your model fields. For the subscription booleans, you can map those to custom properties or use HubSpot’s subscription preferences if you have Marketing Hub. Make sure to include your private app token in the Authorization header as Bearer YOUR_TOKEN. The response structure is also different from InfusionSoft, so you’ll need to update your success/error handling accordingly.

3

The authentication mechanism is completely different between the two platforms which caught me off guard during my migration. InfusionSoft typically uses API keys in query parameters, but HubSpot requires Bearer token authentication in headers. You’ll also need to restructure your error handling since HubSpot returns detailed error objects with specific field validation messages, unlike InfusionSoft’s simpler error responses. One thing that helped me was using HubSpot’s test portal environment first to validate the integration before switching production traffic. The subscription fields you have will likely need to be created as custom properties in HubSpot unless you’re using their marketing subscription system. Make sure to test the webhook responses too since the callback structure is quite different.

4

hubspot api is pretty straighforward once you get the hang of it. you’ll need to swap out that namevaluecollection for json and use their contacts api endpoint. the field mapping is diffrent too - firstname/lastname instead of givenname/familyname. also dont forget to grab an api key from hubspot first