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CRM ⇄ Business productivity

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

Keep Affinity 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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Why teams connect Affinity and Resend

Sync what happens in Resend with the customer records in Affinity, 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 Domains, Email events, API keys, Emails in Resend to Persons, Organizations, Opportunities, Field Values in Affinity with bi-directional, real-time sync. Activity and record changes in Resend update the matching contact or account in Affinity, and CRM data flows the other way wherever Resend can store and use it.

Common use cases

  • Feed open and click events into a warehouse for engagement analytics alongside product data.
  • Sync CRM contact segments into Resend Audiences so lifecycle broadcasts target current data.
  • Sync notes and reminders into project or task systems used outside the deal team.
  • Mirror deal-flow lists into a warehouse or BI tool for pipeline and portfolio reporting.

Where Resend supplies contact or company data

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

Where Resend can store CRM context: fields kept current

Owner, lifecycle stage, or account details from Affinity sync into Resend, so people working there have the context without switching tools.

Where Resend handles support or shared inboxes

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

What you can sync between Affinity 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.

Affinity objects Resend objects
Interactions Automatically captured emails and meetings, read for activity reporting. Contacts Recipient records with email, name, and subscription state, synced from CRMs or databases.
Reminders Follow-up tasks associated with people and organizations. Audiences Named contact lists that broadcasts target; typically mirrored from CRM segments.
Lists Pipelines (deal flow, fundraising, portfolio) that structure most Affinity data; syncs usually target a specific list. Broadcasts One-to-many campaign sends addressed to an audience.
List Entries The membership of a person, organization, or opportunity on a list, carrying its list-specific fields. Domains Verified sending domains with DNS and DKIM status.
Persons Contact records enriched with relationship intelligence, synced with CRMs and outreach tools. Email events Delivered, bounced, complained, opened, and clicked events emitted via webhooks and written back to source systems.
Organizations Company records matched to accounts in other systems by domain. API keys Scoped credentials managed per environment for send and read access.
What ships with Affinity ⇄ Resend

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

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

Real-time

Two-way sync

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

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Affinity 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 Affinity or Resend record.

Observability

Monitoring

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

Trading partners

EDI

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

How the Affinity and Resend connectors work

Affinity

Integration surface
REST API
Authentication
API key
Change detection
Webhook subscriptions for record events, supplemented by polling
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's published API rate limits

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

    Choose tables

    Pick the Affinity 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 · Affinity ⇄ 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
    Affinity Resend
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Affinity and Resend integration FAQ

SECURITY

Security teams love 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
CSA STAR
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 386 integrations available for Affinity and Resend.

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