Real-time
Two-way sync
Changes in Resend or Rillet instantly reflect in both systems. No stale data, no manual imports.
Business productivity ⇄ Accounting and finance
Resend to Rillet integration — real-time, two-way sync
Keep Resend and Rillet 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
Case study
Migrated from Mulesoft
Case study
Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
Case study
Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Resend and Rillet
Connect the financial records in Rillet with the work happening in Resend, so both stay current without exports or copy-paste.
Rillet holds the financial truth: who the customers are, what they were billed, what they paid. Resend is where part of the day-to-day work happens, and that work often involves the same customers and transactions. Without a live connection, the two drift apart, and people end up answering questions from stale copies.
Stacksync keeps Credit Memo, Bill, Journal Entry, Invoice Payment in Rillet and Broadcasts, Domains, Email events, API keys in Resend in sync, bi-directionally and in real time. Whatever records Resend keeps and whatever events it produces, the overlap with Rillet is mapped field by field, and a change on either side shows up on the other within seconds.
There is no middleware to build, no API rate limits to babysit, and no nightly job that leaves the morning running on yesterday's data.
Common use cases
- Sync AR and collection status back to customer success tools ahead of renewals.
- Keep customers and invoices aligned between Rillet and a CRM so finance and sales work from the same account records.
- Write delivery, bounce, and complaint events back to the CRM or a Postgres table for deliverability reporting.
- Trigger transactional sends when a row changes in an operational database, such as an order status update.
Where Resend is a docs or knowledge workspace: reference data kept fresh
Figures teams rely on, like customer status or outstanding balances, stay current wherever Resend surfaces them instead of going stale after a one-time paste.
Where Resend handles customer conversations: billing context in view
Front-line teams see invoice and payment status from Rillet next to the customer they are helping, without logging into the finance system.
Where Resend collects payments or triggers charges: events land in Rillet
Payment and charge activity flows into Rillet as it happens, so the books reflect reality without manual reconciliation.
What you can sync between Resend and Rillet
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.
| Resend objects | Rillet objects | |
|---|---|---|
| Emails Sent messages retrievable by ID with current delivery status. | Vendor Synced with incremental and full sync per the Stacksync docs. | |
| Contacts Recipient records with email, name, and subscription state, synced from CRMs or databases. | Invoice Synced with incremental and full sync per the Stacksync docs. | |
| Audiences Named contact lists that broadcasts target; typically mirrored from CRM segments. | Credit Memo Synced with incremental and full sync per the Stacksync docs. | |
| Broadcasts One-to-many campaign sends addressed to an audience. | Bill Synced with incremental and full sync per the Stacksync docs. | |
| Domains Verified sending domains with DNS and DKIM status. | Journal Entry Synced with incremental and full sync per the Stacksync docs. | |
| Email events Delivered, bounced, complained, opened, and clicked events emitted via webhooks and written back to source systems. | Invoice Payment Synced with incremental and full sync per the Stacksync docs. |
What ships with Resend ⇄ Rillet
Connect Resend and Rillet for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Resend–Rillet connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Resend or Rillet 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 Resend or Rillet record.
Observability
Monitoring
Track your Resend ⇄ Rillet sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Resend and Rillet.
How the Resend and Rillet connectors work
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
Rillet
- Integration surface
- REST API (OpenAPI-specified, with production and sandbox environments)
- Authentication
- API key generated in Rillet (Organization Setting -> API Access); uncheck Read Only for bidirectional sync, check Read Only for one-way sync
- Change detection
- Near real-time updates via change tracking; incremental sync per object, with delete detection (some objects checked every 1h or 4h)
- Capabilities
- read · write · CDC · webhooks
- Rate limits
- Subject to the platform's API rate limits.
How it works
How to connect Resend to Rillet — 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.
- 01
Connect your apps
Authenticate Resend and Rillet with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Resend
connected
Rillet
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Resend and Rillet 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.
objects · Resend ⇄ RilletCustomers 12,480Sales Orders 8,213Invoices 5,902Items 1,344 - 03
Map fields
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Resend RilletCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Resend and Rillet integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Resend and Rillet: authenticate both systems, choose the objects to sync (such as Resend's Emails and Contacts), map fields visually, and changes propagate both ways in milliseconds — no code required.
-
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 Resend and Rillet: Where Resend is a docs or knowledge workspace: reference data kept fresh; Where Resend handles customer conversations: billing context in view; Where Resend collects payments or triggers charges: events land in Rillet. Figures teams rely on, like customer status or outstanding balances, stay current wherever Resend surfaces them instead of going stale after a one-time paste.
-
Resend: REST API. Authentication: API key (Bearer token). Rillet: REST API (OpenAPI-specified, with production and sandbox environments). Authentication: API key generated in Rillet (Organization Setting -> API Access); uncheck Read Only for bidirectional sync, check Read Only for one-way sync. Stacksync manages authentication, retries, and rate limits on both sides.
-
Rillet: The REST API authenticates with API keys and publishes an OpenAPI specification, with separate production and sandbox environments. Resend: Built by the team behind React Email, so templates are commonly authored as React components rendered to HTML at send time. Stacksync's field mapping accounts for these differences between Resend and Rillet without custom code.
-
Stacksync is SOC 2 Type II and ISO 27001 certified with HIPAA BAA support. Data is encrypted in transit, and a zero-persistent-storage architecture means Resend and Rillet records are not retained after a sync operation.
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.
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:
Related integrations
Every pair below is a real-time, two-way sync. Search all 386 integrations available for Resend and Rillet.
Popular · 8 of 386
-
Resend ⇄ Hyperline -
Resend ⇄ Pigment -
Resend ⇄ QuickBooks -
Resend ⇄ Stripe -
Rillet ⇄ Customer.io -
Rillet ⇄ eClinicalWorks -
Rillet ⇄ Full Enrich -
Rillet ⇄ Google Sheets
No integrations match .
