Marketo to MongoDB integration — real-time, two-way sync

Yes. Stacksync provides a managed, real-time two-way integration between Marketo and MongoDB: authenticate both systems, choose the objects to sync (such as Marketo's Opportunities and Opportunity Roles and Custom Objects), map fields visually, and changes propagate both ways in milliseconds — no code required.

On the MongoDB side: Embedded documents and arrays, Indexes, Views, Change streams, plus custom fields where MongoDB exposes them. On the Marketo side: Companies, Opportunities and Opportunity Roles, Custom Objects, Activities and Lead Changes. Stacksync auto-detects both schemas and converts types between the two systems.

Yes. Each object mapping can be bidirectional or restricted to a single direction (both systems accept writes). Read-only mirrors, one-way pushes, and full two-way sync can be mixed in the same integration.

Common patterns for Marketo and MongoDB: Build audiences from your own data; Engagement and results next to the customer; React to marketing changes as row changes. Segments computed in MongoDB from product usage, orders, or account status sync into Marketo as lists or audiences, so campaigns and ads target the people your data says they should.

Marketo: Marketo REST API (JSON over HTTPS) for Leads, Companies, Opportunities, Custom Objects, Activities, Lists, Programs, and Campaigns, plus an asynchronous Bulk Import (leads) and Bulk Extract (leads/activities/program members/custom objects) API and an Asset REST API for emails, forms, and landing pages. Authentication: OAuth 2.0 client_credentials (2-legged): GET the Identity URL /oauth/token?grant_type=client_credentials with a Custom Service client_id and client_secret to receive an access token valid for 3600 seconds, then send it as Authorization: Bearer on each call. The instance base URL is https://{munchkinId}.mktorest.com; passing the token as an access_token query parameter is deprecated (removal July 31, 2026). MongoDB: MongoDB wire protocol via official drivers; Atlas additionally offers an administration REST API for cluster management. Authentication: Database credentials (username/password) or TLS/SSL X.509 certificate (.pem upload), entered individually or via a MongoDB connection string (SRV or standard); Stacksync IP allowlisting required. Stacksync manages authentication, retries, and rate limits on both sides.

MongoDB: Change streams expose ordered change events with resume tokens, so an interrupted sync can pick up exactly where it stopped without a full re-read. Marketo: Leads deduplicate on email address by default (or a configured dedupe field / Marketo id), and POST /rest/v1/leads.json with action createOrUpdate upserts against that key, so records without a match key create duplicates. Stacksync's field mapping accounts for these differences between Marketo and MongoDB without custom code.