Can you integrate Marketo with Salesforce?

Explore a Marketo and Salesforce integration with a Stacksync engineer. Stacksync support for Marketo is not established by the connector documentation reviewed for this page. Start with one record and the update your business needs to identify an implementation path.

Can Marketo and Salesforce sync in both directions?

Confirm two-way support with Stacksync for the records and fields you need in both systems. Access to a vendor API does not confirm that its Stacksync connector supports write-back.

What should be ready before the Marketo and Salesforce initial load?

Prepare both accounts, the selected object schemas, stable source and destination IDs, and the expected outcome. Identify the Marketo account, edition, environment, and business objects the integration must access. Authorize a Salesforce user with API access. Check whether the selected objects can use Apex triggers or require polling. Use the pair worksheet to record ownership and acceptance criteria.

How fast does the Marketo to Salesforce sync run?

Measure initial-load and ongoing-change latency separately. Source detection, selected objects, account limits, and destination validation determine the observed delay.

Will existing duplicates merge automatically?

No. Stacksync documents that pre-existing duplicates are not merged automatically when two-way sync begins. Review the initial dataset and matching plan before enabling it; an empty destination can simplify the first load.

How do I map Marketo fields to Salesforce?

Start with one business entity and a stable record ID. Map a small set of editable fields with compatible types, test required values and relationships, then expand after the pilot passes.

What should I do if a record fails to sync?

Check the destination error, field constraints, permissions, and current source value. The Stacksync issues dashboard supports retry and revert; retry reads current source values, so verify the intended record state before acting.

What does a Marketo and Salesforce integration cost?

Use the current Stacksync pricing page and confirm the supported implementation with the team. Scope the required objects, record volume, update frequency, initial load, and support needs when comparing a managed connector with native or custom development.

Which records should the Marketo and Salesforce pilot start with?

Start by reviewing Companies in Marketo and Accounts in Salesforce. Check how these records relate in your workflow, then confirm the actual fields and supported operations. Test record matching and one failed or repeated update before adding more records.

Marketing / CRM · Two-way sync platform

Marketo and Salesforce integration

Plan how Marketo and Salesforce should share data across your business. Work with Stacksync engineers on record mapping, system access, and the requirements for running the integration.

Scope your workflow with an integration engineer
Review the systems, records, and updates you need

Integration planning

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Marketo

Salesforce

Review the integration scope

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Proposed workflow

Company sync test

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Starting eventA change involving Marketo Companies or Salesforce Accounts needs a defined result in the other system.

Start with Marketo Companies and Salesforce Accounts. Use the record-matching and field-ownership rules from your mapping worksheet.
Resolve parent organizations, business units, and currency references before dependent transactions.
Test a normal update and one failed or repeated update in the supported direction. Keep both record IDs with the test results.

What to verifyUse two organizations with similar names and one with multiple business units. Verify that an update reaches the intended entity only.

Review records and field ownership

Proposed record relationships

Records to connect

Use these examples to define record matching and field ownership for your technical review.

Download the mapping worksheet

CSV · No email required

Example record relationships between Marketo and Salesforce
Marketo record	Salesforce record	Record matching	Field ownership
CompaniesProposed record; confirm Stacksync object support.Record matching	AccountsProposed record; confirm Stacksync object support.	Retain the source company ID and the destination customer/company ID. Separate legal entities, subsidiaries, and business units; a shared name or web domain is insufficient.	Assign ownership separately for relationship details and finance-controlled billing details.
Programs and Program MembersProposed record; confirm Stacksync object support.Record matching	CampaignsProposed record; confirm Stacksync object support.	Keep campaign ID, channel/account context, and separate audience membership IDs.	Marketing owns campaign activation and audience eligibility; analytical metrics do not imply permission to launch a campaign.
Opportunities and Opportunity RolesProposed record; confirm Stacksync object support.Record matching	OpportunitiesProposed record; confirm Stacksync object support.	Keep the opportunity/deal ID separate from any later order or invoice ID.	The sales process owns qualification and stage changes; downstream financial records have their own state and approval rules.

These relationships do not establish connector availability. Review the required connection and record operations with Stacksync.

Record coverage to review

Use documented coverage where available. Catalog record types are starting points for review and do not confirm Stacksync support.

Marketo

Connection and object support require review

Record types to review with Stacksync

Record types	Coverage and requirements
Leads Companies Opportunities and Opportunity Roles Custom Objects Activities and Lead Changes Static Lists	Confirm support for this record type and the direction you need.

Discuss Marketo requirements

Salesforce

Read and write support varies by record

Record types covered in the setup guide

Record types	Coverage and requirements
Writable standard objects (subject to detection mode) Writable custom objects (subject to detection mode)	See connector requirements. Confirm field permissions and sync direction.

Read the Salesforce connector guide

Connection essentials

Confirm Stacksync support and account requirements for undocumented connections. Interface information alone does not establish connector availability.

View setup requirements and limits

Connection requirement	Marketo	Salesforce
Integration interface	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	REST, SOAP, and Bulk APIs
Authentication	Confirm the credentials, API plan, and permissions required for Marketo.	OAuth login via a Salesforce user
Change detection	Confirm how Stacksync detects changes for this connector and the objects you need.	Stacksync uses Apex triggers where permitted, or regular incremental polling when triggers cannot be used.
Read access	Confirm with Stacksync	Available for supported records
Write access	Confirm with Stacksync	Available for supported records

Enterprise controls

Security and control for your integrations

Explore security controls

Compliance and data transfers

As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.

SOC 2 Type II
ISO 27001
HIPAA BAA
GDPR
CCPA
DPF US-EU-UK-CH

SSO & SCIM

Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.

Alerts

Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.

Secure connection options

Securely connects to your systems with:

Record-level recovery

Inspect sync errors and use retry and revert controls to resolve failed updates.

Read the recovery guide

Implementation

Technical reference

Review setup, record relationships, testing, and recovery for your implementation.

Authentication, permissions and API limits

Connection requirements and limits

Marketo

Integration interface: 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: Confirm the credentials, API plan, and permissions required for Marketo.
Change detection: Confirm how Stacksync detects changes for this connector and the objects you need.
Read access: Confirm with Stacksync
Write access: Confirm with Stacksync

Setup requirements

Identify the Marketo account, edition, environment, and business objects the integration must access.
Confirm a Stacksync connector or implementation path for Marketo, including read/write support, authentication, and initial-load limits.

Limitations to check

Confirm Stacksync support for Marketo and the record types your workflow needs.
Review write-back, deletion handling, update timing, and account limits with the integration team.

Salesforce

Integration interface: REST, SOAP, and Bulk APIs
Authentication: OAuth login via a Salesforce user (browser-based authorization flow); requires "API Enabled" permission for polling mode, plus "Author Apex" and "Customize Application" OR "Modify All Data" for trigger mode
Change detection: Stacksync uses Apex triggers where permitted, or regular incremental polling when triggers cannot be used. Confirm the selected mode for each object.
Read access: Available for supported records
Write access: Available for supported records

Setup requirements

Authorize a Salesforce user with API access. Check whether the selected objects can use Apex triggers or require polling.
Test in a sandbox and make the intended objects and fields visible to the connected user.

Limitations to check

Object eligibility depends on write access and the selected detection mode. Non-triggerable objects cannot use trigger mode.
Read-only and formula fields need separate handling; a Salesforce platform capability does not establish support for every object.

Technical documentation

Documentation reviewed 2026-09-15. Check the linked guides for current account and record requirements.

Salesforce setup guide

Prepare Marketo and Salesforce access

Set up both accounts before testing the mapping. Use test records where available, and identify the account administrator who can approve access and help resolve setup errors.

Marketo setup checklist

Identify the Marketo account, edition, environment, and business objects the integration must access.
Confirm a Stacksync connector or implementation path for Marketo, including read/write support, authentication, and initial-load limits.

Salesforce setup checklist

Authorize a Salesforce user with API access. Check whether the selected objects can use Apex triggers or require polling.
Test in a sandbox and make the intended objects and fields visible to the connected user.

Setup guides: Authorize Salesforce

Prepare to go live

Record the fields each system can update, the first-load cutoff, both record IDs, the expected update delay, and who handles errors. Complete the tests before production before expanding to more records.

Use the Marketo and Salesforce planning worksheet to capture these decisions. Record the access owner in the worksheet and enter credentials only in the connection setup.

Talk to an engineer · Review current pricing

Record identity and field ownership

Use these data-model references to describe the records your connection needs. They are planning examples; connector availability and supported operations must be established before implementation.

Download the mapping worksheet · CSV, no email required

Record matching

Companies / Accounts

Compare whether Marketo Companies and Salesforce Accounts describe the same company in your business.

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Marketo: Object support to establish
Salesforce: Object support to establish
Record identity: Retain the source company ID and the destination customer/company ID. Separate legal entities, subsidiaries, and business units; a shared name or web domain is insufficient.
Field ownership: Assign ownership separately for relationship details and finance-controlled billing details.

Fields to include

Source record ID
Legal or display name
Business-unit reference
Lifecycle status

Record dependencies: Resolve parent organizations, business units, and currency references before dependent transactions.
Validation: Use two organizations with similar names and one with multiple business units. Verify that an update reaches the intended entity only.
Recovery: Repair the cross-system ID relationship before retrying dependent records; do not merge companies solely to remove a sync error.

References: Salesforce: Accounts documentation

Record matching

Programs and Program Members / Campaigns

Compare whether Marketo Programs and Program Members and Salesforce Campaigns describe the same campaign or audience in your business.

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Marketo: Object support to establish
Salesforce: Object support to establish
Record identity: Keep campaign ID, channel/account context, and separate audience membership IDs.
Field ownership: Marketing owns campaign activation and audience eligibility; analytical metrics do not imply permission to launch a campaign.

Fields to include

Source campaign ID
Channel reference
Status
Audience references
Measurement window

Record dependencies: Resolve contact/audience identities and channel-account references.
Validation: Test a removed audience member, a paused campaign, and one campaign reported across multiple channels.
Recovery: Rebuild the current eligible audience before retrying activation or membership updates.

References: Salesforce: Campaigns documentation

Record matching

Opportunities and Opportunity Roles / Opportunities

Compare whether Marketo Opportunities and Opportunity Roles and Salesforce Opportunities describe the same deal or opportunity in your business.

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Marketo: Object support to establish
Salesforce: Object support to establish
Record identity: Keep the opportunity/deal ID separate from any later order or invoice ID.
Field ownership: The sales process owns qualification and stage changes; downstream financial records have their own state and approval rules.

Fields to include

Source deal ID
Stage
Amount and currency
Expected close date
Company reference

Record dependencies: Map the customer and sales pipeline before the opportunity; map stage values deliberately.
Validation: Test a reopened won deal, a stage with no destination equivalent, and an amount using a different currency.
Recovery: Suspend downstream creation for a rejected deal and review whether an order already exists before retrying.

References: Salesforce: Opportunities documentation

Record matching

Leads / Leads

Compare whether Marketo Leads and Salesforce Leads describe the same prospect or lead in your business.

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Marketo: Object support to establish
Salesforce: Object support to establish
Record identity: Retain the lead ID and record its relationship to any converted contact or company.
Field ownership: Choose which system may qualify or convert the lead; do not infer identical lifecycle stages.

Fields to include

Source lead ID
Qualification status
Owner reference
Conversion reference

Record dependencies: Resolve owner and campaign references and decide how conversion changes the identity relationship.
Validation: Convert a test lead after the first load and verify that it does not create a duplicate person or orphan its activity.
Recovery: Repair the lead-to-contact conversion link before replaying later updates.

References: Salesforce: Leads documentation

Compare integration approaches

Choose a method around one example record and the update your business needs. Use Companies / Accounts to review record matching and confirm Stacksync support for the required operations. Compare ongoing sync, a custom workflow, and a scheduled export against that requirement.

Stacksync managed sync

Best fit: Review compatibility with a Stacksync engineer using an example of the records and updates you need.
Operating responsibility: Fits ongoing record synchronization when the required operations are supported. Add workflow steps for approvals or business actions that go beyond copying fields.
Before you choose: Check record matching: Retain the source company ID and the destination customer/company ID. Separate legal entities, subsidiaries, and business units; a shared name or web domain is insufficient. Verify field coverage, deletion handling, and how changes are detected.

Native vendor integration

Best fit: A vendor-built integration may fit if it supports your Marketo and Salesforce record types.
Operating responsibility: Can reduce setup for a supported workflow. You may need another method for records or business steps it does not cover.
Before you choose: First check whether either vendor offers this integration. If available, verify Companies / Accounts, update direction, account tier, and related-record handling.

Custom API or workflow

Best fit: Consider when Marketo and Salesforce need a transformation, approval, or action outside a direct record sync.
Operating responsibility: Provides control over business steps; the team owns credentials, version changes, error queues, and reconciliation.
Before you choose: Verify endpoint permissions, pagination, quotas, duplicate detection, and failure recovery.

File or scheduled snapshot

Best fit: Consider for a one-time Marketo / Salesforce migration or a reporting need with an explicit freshness window.
Operating responsibility: Can simplify a bounded transfer; later changes and deletion history require another extraction or a separately designed incremental process.
Before you choose: Record the extraction cutoff, source IDs, encoding, date/number formats, and reconciliation totals.

Workflow scenarios and expected results

Company sync test

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Starting event: A change to the selected Companies or Accounts record needs a defined result in the other system.

Start with Marketo Companies and Salesforce Accounts. Use the record-matching and field-ownership rules from your mapping worksheet.
Resolve parent organizations, business units, and currency references before dependent transactions.
Test a normal update and one failed or repeated update in the supported direction. Keep both record IDs with the test results.

Expected result: Use two organizations with similar names and one with multiple business units. Verify that an update reaches the intended entity only.

If it fails: Repair the cross-system ID relationship before retrying dependent records; do not merge companies solely to remove a sync error.

Campaign or audience sync test

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Starting event: A change to the selected Programs and Program Members or Campaigns record needs a defined result in the other system.

Start with Marketo Programs and Program Members and Salesforce Campaigns. Use the record-matching and field-ownership rules from your mapping worksheet.
Resolve contact/audience identities and channel-account references.
Test a normal update and one failed or repeated update in the supported direction. Keep both record IDs with the test results.

Expected result: Test a removed audience member, a paused campaign, and one campaign reported across multiple channels.

If it fails: Rebuild the current eligible audience before retrying activation or membership updates.

Deal or opportunity sync test

Planning example. Stacksync support for the required connection and record operations needs a technical review.

Starting event: A change to the selected Opportunities and Opportunity Roles or Opportunities record needs a defined result in the other system.

Start with Marketo Opportunities and Opportunity Roles and Salesforce Opportunities. Use the record-matching and field-ownership rules from your mapping worksheet.
Map the customer and sales pipeline before the opportunity; map stage values deliberately.
Test a normal update and one failed or repeated update in the supported direction. Keep both record IDs with the test results.

Expected result: Test a reopened won deal, a stage with no destination equivalent, and an amount using a different currency.

If it fails: Suspend downstream creation for a rejected deal and review whether an order already exists before retrying.

Link audience context between Marketo and Salesforce

This is an evaluation scenario; connector and operation support require confirmation.

Starting event: An approved customer or campaign change affects eligibility or reporting in Marketo.

Identify the relevant Leads or Companies and the corresponding identity in Accounts or Contacts.
Choose the authority for consent, audience membership, and campaign activation. Reporting a customer attribute does not authorize outreach.
Define how unsubscribes, deleted identities, and late activity change the current audience.

Start with the failed record and the destination error, then inspect the source value, field requirements, and access.

Rejected or repeated company change

Investigate

Inspect Marketo Companies and Salesforce Accounts, their IDs, and the destination error.

Next action

Repair the cross-system ID relationship before retrying dependent records; do not merge companies solely to remove a sync error.

Rejected or repeated campaign or audience change

Investigate

Inspect Marketo Programs and Program Members and Salesforce Campaigns, their IDs, and the destination error.

Next action

Rebuild the current eligible audience before retrying activation or membership updates.

Rejected or repeated deal or opportunity change

Investigate

Inspect Marketo Opportunities and Opportunity Roles and Salesforce Opportunities, their IDs, and the destination error.

Next action

Suspend downstream creation for a rejected deal and review whether an order already exists before retrying.

A record type or update is unavailable

Investigate

Check the Marketo and Salesforce connector guides, account permissions, and any operations marked On Request.

Next action

Ask the integration team to confirm a supported way to handle that record. Verify whether it needs connector configuration or a separate workflow step.

Source and destination disagree after a retry

Investigate

Compare current source values, destination validation, identity mappings, and any side effects already completed.

Next action

Stacksync issue retry reads the current source state. Decide the intended state before retrying or reverting; reconcile downstream effects separately.

Read the Stacksync issues dashboard guide for retry and revert behavior.

Change detection and update delivery

How updates move between Marketo and Salesforce

See how each system detects changes and which updates the other system can receive. Each direction has its own permissions and record requirements.

Marketo Salesforce Direction requires confirmation

Detect changesConfirm how Stacksync detects changes for this connector and the objects you need.

Apply updatesConfirm that Stacksync can create or update the records you need in Salesforce.

Salesforce Marketo Direction requires confirmation

Detect changesStacksync uses Apex triggers where permitted, or regular incremental polling when triggers cannot be used. Confirm the selected mode for each object.

Apply updatesConfirm that Stacksync can create or update the records you need in Marketo.

Update timing and record limits

Measure initial-load and ongoing-change latency separately. Source detection, selected objects, account limits, and destination validation determine the observed delay.
Review write-back, deletion handling, update timing, and account limits with the integration team.

FAQ