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July 15, 2026
Webhook endpoints: added phone menu event support

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Added

Phone menu event for webhooks. Create and update webhook endpoints now support the call.menu.selected event, which fires when a caller reaches a routing decision in a phone menu (IVR). See Webhook event payloads for the schema.
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July 13, 2026
Contacts

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Added

Get a contact by ID. GET /contacts/{contactId} retrieves detailed information about a specific contact in your Quo workspace using the contact’s unique identifier.
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July 9, 2026
Webhook endpoints: added task event support

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Added

Task events for webhooks. Create and update webhook endpoints now support events: task.created, task.updated, task.deleted, task.completed, task.reopened, task.assigned, task.unassigned, task.overdue, task.linked, task.unlinked, task.duedate.updated, task.duedate.removed.
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July 8, 2026
Contacts

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Added

List contacts. GET /contacts returns a paginated list of contacts. Filter by externalIds or sources to narrow results.
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June 18, 2026
Webhooks

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Added

Webhook API. The webhook API is now available in this version. Subscribe an HTTPS endpoint to real-time message, call, and contact events, with signed and automatically retried deliveries. See the overview and quickstart to get started.Managing subscriptions. POST /webhooks creates a subscription; companion endpoints list, update, and delete subscriptions, rotate the signing secret, inspect deliveries, retry a delivery, and send a test event. A workspace can have up to 50 webhooks.Events. Message (received, delivered, failed), the full call lifecycle, and contact (updated, deleted) events are supported. See Webhook event payloads for every schema.
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June 16, 2026
Mark conversations as done or open

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Added

Mark a conversation as done. POST /conversations/{conversationId}/mark-as-done removes a conversation from the inbox without sending a message and returns the updated conversation.Mark a conversation as open. POST /conversations/{conversationId}/mark-as-open moves a conversation back to the inbox without sending a message and returns the updated conversation.
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June 15, 2026
Mark as read & message retry

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Added

Mark a conversation as read. POST /conversations/{conversationId}/mark-as-read clears a conversation’s unread indicator without sending a message and returns the updated conversation.Retry a failed message. POST /messages/{messageId}/retry re-attempts delivery of a message in a failed or undelivered state. Messages that have permanently failed with an error code cannot be retried.
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June 5, 2026
Users

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Added

List users. GET /users returns a paginated list of users in your Quo workspace.Get user by ID. GET /users/{userId} retrieves detailed information about a specific workspace user.
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March 30, 2026
2026-03-30 — Initial release

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API versioning

The Quo API now uses header-based versioning. Specify your target version by passing the Quo-Api-Version header on every request:
Version policy. A new version is only introduced when a breaking change is necessary — for example, removing a field, changing a field’s type, or altering existing behavior in an incompatible way. New endpoints, new optional fields, and bug fixes are added to the current version without a new version being published. See Versioning for the full contract.