If you want to add Campaign Monitor form in AMP then first you need to purchase and install Opt-in Forms for AMP plugin.
After installing you will find this option in WordPress Dashboard -> AMP optin -> Add New optin -> select “ Campaign Monitor ” option -> now you need API KEY, list ID.

How to get Campaign Monitor API Key
Once you set up and logged in to your Campaign Monitor account successfully, please follow the steps below to get API Key and List ID.
Step 1 – Under the administrator dashboard, click Account Settings.

Step 2 – Locate the API keys on the right of the screen.

Step 3 – By default the Client ID is visible but you need to click Show API key to see your API key.

How to find your Campaign Monitor LIST ID
Step 1 – First of all Signup/login at Campaign Monitor.
Step 2 – Select ‘Lists and subscribers’ from the top menu

Step 3 – Click on the list that you want to integrate
Step 4 – Click the ‘change name/type’ option

Step 5 – Copy this List ID

Step 6 – Now enter the “API KEY” and “List ID” and copy the shortcode and place where you want to display the Campaign Monitor Form.

- Company: Select Campaign Monitor Option.
- API Key: Paste API Key from Campaign Monitor Account
- List ID: Paste List ID from Campaign Monitor Account
Step 7 – Click on the “Publish” button.
The Output of Campaign Monitor in AMP
Make sure you need to fill this form and then click on the submit button after that you will get the “Subscription successful” message.

That’s it for this tutorial!
We hope it helped you. If you have any feedback or questions, then please share them in the comments section below.