aMember has a ConvertKit integration built directly into their product!
For questions about how to use it or get access, please contact their customer support team.
How to configure the integration
Start by finding ConvertKit under the Newsletter Plugins menu in aMember.
Next you'll want to copy your ConvertKit API key. You'll find this on the Advanced Settings page of your ConvertKit account.
Copy the "API Key" value from ConvertKit and paste it into aMember ConvertKit plugin settings (shown below). You'll also want to click 'Show' underneath the 'API Secret' box in ConvertKit. Copy this value and paste it into your aMember plugin settings.
To connect your sign ups to individual ConvertKit forms, go to aMember CP > Protect Content > Newsletters.