API keys are secure access codes that let Kit communicate with other applications. Think of them as special passwords that allow controlled access to your account data.
To create and automate your individual workflows, you can access our V4 API. To do so, go to Developer Settings.
With our API V4, you'll have:
Fully functional Broadcast API: Enjoy full HTML support and segmentation targeting.
Quality of life enhancements: Benefit from cursor pagination and consistent error handling.
Improved performance and security for your workflows.
If you are using our API V3, please note that while it will remain accessible for the foreseeable future, it's no longer in active development. To access any current and future new functionality, you'll need to move any setups you have to V4, as they cannot be used interchangeably. We reserve the right to deprecate API V3 in the future as we transition developers onto V4.
Creating V4 API keys
Under the V4 Keys section:
Click on "Add a new key"
Give it an internal name
Copy and save the API key.
Please make sure to save your API key and keep it somewhere safe, as you'll not see it again after leaving the screen.
Resetting & deleting V4 API keys
If you've misplaced it, you can go back to your API keys, and reset it by editing the API key:
If you ever no longer need an API Key, you can also delete it by editing the API Key, and click on "Delete API Key".
API keys are only meant for individual use. If you're creating something for people to use, you'll need to build an app for access to plugins, bulk end points, and higher rate limits.
Difference between V3 and V4 API keys
V3 API keys
V3 is our legacy API that most of our older integrations were built on.
For any third-party integrations that require a Kit API key to integrate, you'll need to provide them with a V3 API key. You'll find this in your Developer settings under the V3 API key section.
We will be looking to move these integrations into apps to provide a seamless OAuth experience between Kit and any third-party tool you use.
V4 API keys
V4 API is currently only available in your Developer settings.
If you're a developer working on an app, the V4 API keys are for you to test our API for your future app without the need for OAuth authentication. This makes it faster and easier to prototype and test out functionality before fully committing to building your app out. If you are looking to publish an app for public listing and installation, you must use OAuth and not API Keys.
V4 API keys are only meant for individual use—for testing and for you to automate your own workflows. If you're creating an app or integration for more customers, you'll still need to use apps for access to plugins, bulk endpoints, higher rate limits, and more.
For V4 API documentation, please see here.