The ConvertKit API integration is only available if you have a ConvertKit account.
Step 1: To find your ConvertKit API key head to Settings > Advanced > Scroll down to API:
Step 2: Once there, you'll see the options for Your API Key and API Secret. You'll want to copy the API Secret Key:
Step 3: Once you have the Secret API key head over to Grow Publisher Portal > Site Settings > Integrations and add the Secret API key:
Note: If you’ve previously added Your API Key, you don’t need to add the Secret API key, but we suggest you do. You’ll continue to see fields for both API keys until Your API key is removed. Grow moved to using the Secret API key August 2022.
Step 4: Make sure to click Save Changes once you’ve added the ConvertKit Secret API key.