Customer.io

Messaging automation: customer profiles, events, campaigns, and transactional messages

Customer.io API referenceAPI checked August 18, 2026

Signs in with: API token
Runs on: Cloud or On-Prem Worker
Operations: 65
Ready-made triggers: 0

Connect Customer.io

In Neblex open Connect › Connections and click New Connection.
Search for Customer.io and give the connection a clear name.
Fill in the fields. Secret values are encrypted and never shown again.
Click Test, then Create Connection.

Field	What to enter
Access tokenRequiredSecret

Use it in a flow

Open a flow, open the node library and search for Customer.io.
Drag it onto the canvas and choose an Operation and your connection.
Map the operation's fields from earlier steps, or click Map with Matt.
Use Test this step to see what it returns, then save.

To start a flow from Customer.io without a ready-made trigger: a Poll for changes trigger can check one of its list operations on a schedule and pass on only what is new; if Customer.io can send webhooks, a Webhook trigger receives them at its own URL.

Operations

65 operations in 16 groups. Each one is a step you can add to a flow.

Activity1

List activitieslistActivities GET The workspace activity log.

Broadcast6

Get a broadcast`getBroadcast`	GET	One broadcast.
Get a trigger's status`getBroadcastTriggerStatus`	GET	The processing status of one broadcast trigger.
Get broadcast metrics`getBroadcastMetrics`	GET	A broadcast's metric series.
List broadcast actions`listBroadcastActions`	GET	A broadcast's actions.
List broadcasts`listBroadcasts`	GET	The workspace's broadcasts.
Trigger a broadcast`triggerBroadcast`	POST	Start an API-triggered broadcast (data + audience/emails/ids/per-recipient maps).

Campaign8

Get a campaign`getCampaign`	GET	Fetch a campaign by ID.
Get a campaign action`getCampaignAction`	GET	One workflow action.
Get campaign metrics`getCampaignMetrics`	GET	A campaign's metric series.
Get journey metrics`getCampaignJourneyMetrics`	GET	A campaign's journey metrics over a time range.
List campaign actions`listCampaignActions`	GET	A campaign's workflow actions.
List campaign messages`listCampaignMessages`	GET	Messages a campaign sent.
List campaigns`listCampaigns`	GET	List your campaigns.
Update a campaign action`updateCampaignAction`	PUT	Update a workflow action (body/sending state).

Collection7

Create a collection`createCollection`	POST	Create a collection from inline data or a URL.
Delete a collection`deleteCollection`	DELETE	Delete a collection.
Get a collection`getCollection`	GET	One collection's metadata.
Get collection content`getCollectionContent`	GET	A collection's row data.
List collections`listCollections`	GET	The workspace's collections.
Replace collection content`updateCollectionContent`	PUT	Replace a collection's row data.
Update a collection`updateCollection`	PUT	Update a collection's name or data source.

Customer7

Find customers by email`lookupCustomersByEmail`	GET	The customers registered under an email address.
Get a customer's activities`getCustomerActivities`	GET	A customer's activity log.
Get a customer's attributes`getCustomerAttributes`	GET	A customer's attribute values.
Get a customer's messages`getCustomerMessages`	GET	Messages sent to a customer.
Get a customer's relationships`getCustomerRelationships`	GET	The objects a customer is related to.
Get a customer's segments`getCustomerSegments`	GET	The segments a customer belongs to.
Search customers`searchCustomers`	POST	Search customers with a filter (segment/attribute conditions).

Export5

Download an export`downloadExport`	GET	A signed download link for a completed export.
Export customers`exportCustomers`	POST	Start a customer export from a search filter.
Export deliveries`exportDeliveries`	POST	Start a deliveries export (newsletter/campaign/action scope).
Get an export`getExport`	GET	One export's status.
List exports`listExports`	GET	The workspace's exports.

Message3

Get a message`getMessage`	GET	One delivered message's metadata.
Get archived message content`getArchivedMessage`	GET	The archived content of a delivered message.
List messages`listMessages`	GET	Page through delivered messages.

Newsletter4

Get a newsletter`getNewsletter`	GET	One newsletter.
Get newsletter metrics`getNewsletterMetrics`	GET	A newsletter's metric series.
List newsletter contents`listNewsletterContents`	GET	A newsletter's content variants.
List newsletters`listNewsletters`	GET	The workspace's newsletters.

Object1

List object typeslistObjectTypes GET The workspace's object types.

Segment7

Create a manual segment`createManualSegment`	POST	Create a manual segment.
Delete a segment`deleteSegment`	DELETE	Delete a manual segment.
Get a segment`getSegment`	GET	One segment.
Get segment customer count`getSegmentCustomerCount`	GET	How many customers a segment has.
Get segment dependencies`getSegmentDependencies`	GET	The campaigns/newsletters using a segment.
List segment members`listSegmentMembership`	GET	Page through a segment's members.
List segments`listSegments`	GET	The workspace's segments.

Sender2

Get a sender identity`getSenderIdentity`	GET	One sender identity.
List sender identities`listSenderIdentities`	GET	The workspace's sender identities.

Snippet3

Delete a snippet`deleteSnippet`	DELETE	Delete a snippet by name.
List snippets`listSnippets`	GET	The workspace's snippets.
Update snippets`upsertSnippet`	PUT	Create or update snippets.

Subscription1

List subscription topicslistSubscriptionTopics GET The workspace's subscription topics.

Transactional4

Get a transactional message`getTransactional`	GET	One transactional message template.
List transactional messages`listTransactional`	GET	The workspace's transactional message templates.
Send a transactional email`sendTransactionalEmail`	POST	Send a transactional email (by transactional message id, or fully inline with body + subject + from).
Send a transactional push`sendTransactionalPush`	POST	Send a transactional push notification.

Webhook5

Create a reporting webhook`createReportingWebhook`	POST	Subscribe a URL to reporting events.
Delete a reporting webhook`deleteReportingWebhook`	DELETE	Delete a reporting webhook.
Get a reporting webhook`getReportingWebhook`	GET	One reporting webhook.
List reporting webhooks`listReportingWebhooks`	GET	The workspace's reporting webhooks.
Update a reporting webhook`updateReportingWebhook`	PUT	Update a reporting webhook.

Workspace1

List workspaceslistWorkspaces GET The workspaces visible to this key.