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CRM ⇄ Business productivity

Close to Resend integration — real-time, two-way sync

Keep Close and Resend in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.

  • SOC 2 and 6 other compliance frameworks
  • POC with real engineers in minutes

Adopted by fast-scaling companies moving mission-critical data in real time

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Migrated from MuleSoft
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Migrated from Matillion
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Migrated from Fivetran
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Why teams connect Close and Resend

Sync what happens in Resend with the customer records in Close, in real time and in both directions.

The CRM is supposed to be the record of every customer relationship, but customer-relevant information also accumulates in the other tools a team runs. Whatever Resend holds or produces that touches a customer, whether conversations, payments, replies, enriched data, or notes, the CRM only benefits if it arrives without someone copying it over.

Stacksync connects Audiences, Broadcasts, Domains, Email events in Resend to Smart Views, Leads, Contacts, Opportunities in Close with bi-directional, real-time sync. Activity and record changes in Resend update the matching contact or account in Close, and CRM data flows the other way wherever Resend can store and use it.

Common use cases

  • 01 Keep suppression and unsubscribe state synced between Resend and other marketing tools to stay compliant.
  • 02 Feed open and click events into a warehouse for engagement analytics alongside product data.
  • 03 Write product usage or firmographic data from an internal database onto Close lead custom fields to prioritize follow-up.
  • 04 Sync Close leads and opportunities into Postgres or a warehouse for pipeline reporting outside Close's built-in reports.

Common sync patterns

Where Resend handles support or shared inboxes

Tickets and conversations attach to the right contact and account in Close, so sales sees open issues before the next call.

Where Resend runs outreach

Prospects, sends, and replies sync into Close, keeping lead status current without manual imports.

Where Resend supplies contact or company data

Enriched fields land directly on records in Close, and refreshes keep them from going stale.

What you can sync between Close and Resend

Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.

Close objects Resend objects How this pairing syncs
Contacts People nested under a lead, with emails and phone numbers used for outreach syncs. Contacts Recipient records with email, name, and subscription state, synced from CRMs or databases. Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions.
Leads The top-level record in Close; represents a company and holds its contacts, opportunities, and activity history. Broadcasts One-to-many campaign sends addressed to an audience. Leads is specific to Close and Broadcasts to Resend — each maps to any object or custom field on the other side.
Opportunities Deal records with value, confidence, and status; commonly synced to reporting and billing systems. Domains Verified sending domains with DNS and DKIM status. Opportunities is specific to Close and Domains to Resend — each maps to any object or custom field on the other side.
Activities Calls, emails, SMS, notes, and meetings logged against a lead; the source for engagement analytics. Email events Delivered, bounced, complained, opened, and clicked events emitted via webhooks and written back to source systems. Activities is specific to Close and Email events to Resend — each maps to any object or custom field on the other side.
Tasks Follow-up items assigned to users; synced for workload and SLA reporting. API keys Scoped credentials managed per environment for send and read access. Tasks is specific to Close and API keys to Resend — each maps to any object or custom field on the other side.
Custom Activities User-defined activity types with their own custom fields, mapped like standard activities. Emails Sent messages retrievable by ID with current delivery status. Custom Activities is specific to Close and Emails to Resend — each maps to any object or custom field on the other side.

How changes propagate between Close and Resend

Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.

Close Resend Sub-second propagation

DetectionClose notifies Stacksync of record changes through webhook events. Webhook subscriptions for record events, with polling on date_updated fields for backfills.

DeliveryEach detected change is written to Resend through its API, with automatic retries and rate-limit backoff.

Resend Close Sub-second propagation

DetectionResend notifies Stacksync of record changes through webhook events. Webhooks for email lifecycle events.

DeliveryEach detected change is written to Close through its API, with automatic retries and rate-limit backoff.

Rate-limit considerations

  • Close: Subject to per-endpoint rate limits communicated in response headers.
What ships with Close ⇄ Resend

Connect Close and Resend for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Close–Resend connection.

Real-time

Two-way sync

Changes in Close or Resend instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Close or Resend data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.

At scale

Event queues

Handle millions of events per minute without losing a single Close or Resend record.

Observability

Monitoring

Track your Close ⇄ Resend sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Close and Resend.

How the Close and Resend connectors work

Close

Integration surface
REST API
Authentication
API key (sent via HTTP Basic auth)
Change detection
Webhook subscriptions for record events, with polling on date_updated fields for backfills
Capabilities
read · write · webhooks
Rate limits
Subject to per-endpoint rate limits communicated in response headers

Resend

Integration surface
REST API
Authentication
API key (Bearer token)
Change detection
Webhooks for email lifecycle events; polling for contact and audience state
Capabilities
read · write · webhooks
How it works

How to connect Close to Resend — three steps, no code

Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.

  1. 01

    Connect your apps

    Authenticate Close and Resend with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.

    • OAuth 2.0
    • SSH tunnel
    • VPC peering
    Close connected
    Resend connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Close and Resend objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.

    • Standard objects
    • Custom objects
    • Auto-schema
    objects · Close ⇄ Resend
    Customers 12,480
    Sales Orders 8,213
    Invoices 5,902
    Items 1,344
  3. 03

    Map fields

    Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.

    • Auto-map
    • Type casting
    • Transforms
    Close Resend
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Close and Resend integration FAQ

SECURITY

Security teams trust Stacksync

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.

Learn more about security
SOC 2 Type II
ISO 27001
HIPAA BAA
GDPR
CCPA
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS

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:

OAuth 2 SSH Tunnelling SSL certificates IP Whitelisting VPN gateway VPC peering and more

Related integrations

Every pair below is a real-time, two-way sync. Search all 418 integrations available for Close and Resend.

Popular · 8 of 418
All Close integrations All Resend integrations Browse all integrations
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