Omnisend Automation

Automate ecommerce marketing operations -- create and update contacts, manage subscriber lists with cursor pagination, run bulk batch operations, and segment audiences -- all orchestrated through the Composio MCP integration.

Toolkit docs: composio.dev/toolkits/omnisend

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Setup

1. Connect your Omnisend account through the Composio MCP server at https://rube.app/mcp
2. The agent will prompt you with an authentication link if no active connection exists
3. Once connected, all OMNISEND_* tools become available for execution

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Core Workflows

1. Create or Update a Contact

Upsert a contact by email identifier with subscription status, profile fields, and optional welcome message.

Tool: OMNISEND_CREATE_OR_UPDATE_CONTACT

Parameter	Type	Required	Description
identifiers	array	Yes	At least one identifier object with id (email), type (email), optional channels.email.status (subscribed, nonSubscribed, unsubscribed), and sendWelcomeMessage (boolean)
firstName	string	No	Contact's first name
lastName	string	No	Contact's last name
gender	string	No	m or f
birthdate	string	No	Format: YYYY-MM-DD
country	string	No	Full country name
countryCode	string	No	ISO 3166-1 alpha-2 code (e.g., US)
city	string	No	City name
address	string	No	Street address
postalCode	string	No	ZIP/postal code

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2. List Contacts with Pagination

Retrieve contacts in batches with optional filters for email, phone, status, segment, or tag.

Tool: OMNISEND_LIST_CONTACTS

Parameter	Type	Required	Description
limit	integer	No	Results per page (default: 100, max: 250)
after	string	No	Cursor for next page (base64-encoded ContactID)
before	string	No	Cursor for previous page
email	string	No	Filter by exact email address
phone	string	No	Filter by full phone number with country code
status	string	No	Filter by: subscribed, nonSubscribed, unsubscribed
segmentID	integer	No	Filter by segment ID
tag	string	No	Filter by tag (e.g., VIP)

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3. Get Contact Details

Retrieve the full profile for a single contact when you already have their contact ID.

Tool: OMNISEND_GET_CONTACT

Parameter	Type	Required	Description
contactId	string	Yes	Unique contact identifier (e.g., 60e7412b1234567890abcdef)

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4. Update an Existing Contact

Patch specific fields on a contact by ID without overwriting the entire record.

Tool: OMNISEND_UPDATE_CONTACT

Requires the contactId and the fields to update. Retrieve the contact ID first via OMNISEND_LIST_CONTACTS or OMNISEND_GET_CONTACT.

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5. Bulk Batch Operations

Process many records asynchronously in a single call -- contacts, products, orders, events, or categories.

Tool: OMNISEND_CREATE_BATCH

Parameter	Type	Required	Description
method	string	Yes	POST or PUT
endpoint	string	Yes	Target: contacts, orders, products, events, categories
items	array	Yes	Array of payload objects for each operation
eventID	string	Conditional	Required when endpoint is events

Use batch operations to avoid rate limits when processing large data sets.

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Known Pitfalls

Pitfall	Details
Identifier required	OMNISEND_CREATE_OR_UPDATE_CONTACT requires at least one identifier in the identifiers array -- only email type is supported
Cursor-based pagination	OMNISEND_LIST_CONTACTS uses base64-encoded after/before cursors, not page numbers -- follow cursors to avoid incomplete data
Contact ID resolution	OMNISEND_UPDATE_CONTACT requires a contactId -- always resolve it first via list or get operations
Batch method constraints	OMNISEND_CREATE_BATCH only accepts POST or PUT methods -- no DELETE or PATCH
Event ID dependency	When batching events, the eventID parameter is mandatory -- omitting it causes the batch to fail

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Quick Reference

Tool Slug	Purpose
OMNISEND_CREATE_OR_UPDATE_CONTACT	Create or upsert a contact by email
OMNISEND_LIST_CONTACTS	List contacts with filtering and cursor pagination
OMNISEND_GET_CONTACT	Get full profile for a single contact by ID
OMNISEND_UPDATE_CONTACT	Patch specific fields on an existing contact
OMNISEND_CREATE_BATCH	Bulk async operations for contacts, products, orders, events

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