The Campaign Monitor integration with OptiMonk adds subscribers to your Campaign Monitor list when they fill out an OptiMonk popup form. It comes in handy if you run marketing campaigns regularly, so the subscribers who signed up via OptiMonk also get news about your upcoming promotions.

Before you start: you need a Campaign Monitor account and a campaign in OptiMonk whose popup is already built. The field mapping step reads the input fields straight from your popup, so there is nothing to map until the popup exists.

Step 1: Find your Campaign Monitor API key

In Campaign Monitor, click Account Settings in the top menu bar, then API keys in the right column menu. Click Show API key and copy the value.

Step 2: Connect Campaign Monitor to your campaign

  1. Open Campaigns in the left menu and click the campaign you want to connect with Campaign Monitor.

  2. Open the Integrations tab of the campaign.

  3. Click Add integration. If the campaign has no integration yet, the same step is offered as Connect your email or SMS tool.

  4. Provider step: type campaign into the Search providers… box and pick Campaign Monitor from the All providers grid. Accounts you have already connected are listed above the grid, under Your connected accounts.

  5. Account step: choose a Campaign Monitor account you have already connected, or fill in the credential form to add a new one.

    • Name (optional) — a label so you recognise this connection later.

    • API key — paste the key from Step 1. The form reminds you where it lives: Account Settings -> API Key.

    Click Connect.


    There is no separate Test Connection button any more. OptiMonk checks the key while it saves the connection: if the key is wrong, the wizard stays on this step and shows Connection failed — check the credentials under the form. A successful connect takes you straight to the next step.

  6. Settings step: two dropdowns, one after the other.

    • Client — the Campaign Monitor client whose lists you want to use.

    • List — the subscriber list new signups should join. This dropdown stays greyed out until you pick a client, and reloads whenever you change the client.

    Click Continue.

  7. Field mapping step: decide where each popup field goes in Campaign Monitor (see below), then click Save integration.

That's it. Whenever a visitor signs up through your popup, they are added to the Campaign Monitor list you picked.


Draft vs. live: if the campaign has not been published yet, the integration is shown with a Draft pill and the note Saved as draft — it goes live when you publish the campaign. On a published campaign the integration is applied right away and shows as Active.

Field mapping

The mapping table has two columns: Popup field on the left (every input your popup collects) and Campaign Monitor field on the right. OptiMonk pre-fills the mapping with its own suggestions, so in most cases you only need to check it.

  • The email field is fixed — it always maps to email.

  • Pick Don't sync for any popup field you don't want to send.

  • If Campaign Monitor returns the custom fields of the selected list, the right column is a dropdown. If it doesn't, you get a free-text box instead and the hint Type the exact Campaign Monitor field or property name (e.g. first_name). Leave empty to skip a field.

Marking where a subscriber came from

The old admin had a Source Field name dropdown with a Refresh button next to it. That is now a static field: instead of picking a "source" field, you send a fixed value with every submission.

  1. In Campaign Monitor, open Lists & Subscribers, select the list you are sending subscribers to, click Custom fields in the right column menu, then Add custom field. Name it OptiMonk and check that the Data Type is Text.

  2. Back in the OptiMonk mapping step, scroll to Static fields and click Add static field. Type the value you want stored on the left (for example OptiMonk or Summer Ad Campaign) and choose the OptiMonk custom field on the right.

There is no Refresh button: the field list is fetched when the mapping step opens, so if you add the custom field in Campaign Monitor after opening the wizard, go Back one step and forward again.

Change or remove the integration

The Integrations tab lists every integration on the campaign.

  • Change list reopens the wizard at the Settings step, so you can pick a different client or list and go on to the mapping.

  • The bin icon removes the integration from this campaign: Remove from this campaign? The account connection stays and can be added again. Your Campaign Monitor API key is not deleted, so you can reuse the same connection on another campaign.