This integration lets you push your Mailkick email HTML into Customer.io journey actions or newsletter templates.
Prerequisites
- You must be a workspace admin.
- You need a Customer.io App API Key.
- You must know your Customer.io region: US or EU.
Step 1 — Find your Customer.io API key
In Customer.io, generate/copy an App API Key from your workspace settings (API keys section).
If your workspace is on the EU region, make sure you also know you’re on EU (Mailkick needs it to use the correct API base URL).
Step 2 — Add Customer.io in Mailkick
- Open Settings → Integrations
- Select Customer.io
- Paste your API key
- Select Region (US/EU)
- (Optional) Fill Site ID
- Click Save changes
Customer.io sync requires a link that identifies what you want to update.
- Open your email in the editor
- Open Settings (email settings)
- Fill Sending tool link
Supported link formats:
- Journey action:
.../workspaces/<workspaceId>/journeys/.../actions/<actionId>
- Newsletter template:
.../journeys/composer/newsletters/<newsletterId>/templates/<templateId>
If the link is invalid, Mailkick will block the sync with a validation error.
Step 3 — Sync an email
- Click Export
- Click Sync to Customer.io
If nothing changed since the last sync, Mailkick will skip the API call (“Already up to date”).
Common issues
- “Enter the Customer.io Sending tool link before syncing”: the email is missing the link.
- “Region must be us or eu”: set the region in Settings → Integrations → Customer.io.
