Real-time
Two-way sync
Changes in Bill or SAP instantly reflect in both systems. No stale data, no manual imports.
Accounting and finance ⇄ ERP
Bill to SAP integration — real-time, two-way sync
Keep Bill and SAP 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 Celigo
Migrated from Heroku Connect
Migrated from Matillion
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Migrated from Fivetran
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Migrated from Celigo
Why teams connect Bill and SAP
Keep Bill and SAP agreeing on customers, invoices, and balances, whether they split the finance workload or one is replacing the other.
A dedicated finance tool and an ERP end up side by side for practical reasons: a subsidiary runs lighter software than headquarters, billing runs in a specialist system while the enterprise system holds the wider view, or the company is mid-migration and both are live. Whatever the split, the two systems describe overlapping customers and transactions, and that overlap drifts without a live connection.
Stacksync syncs Vendors, Invoices, Customers, Payments in Bill with Purchase Orders, Outbound Deliveries, Billing Documents, GL Accounts and Journal Entries in SAP in real time and in both directions. You decide which system wins on which field, and every change made in one is reflected in the other within seconds instead of at the next batch run.
Common use cases
- 01 Read approved Bills and their line items into a Postgres warehouse for spend, accrual, and cash-flow reporting without CSV exports.
- 02 Sync Customers and Invoices from BILL AR into a CRM or ERP so sales and finance see billing and payment status on the account.
- 03 Replicate journal entries and billing documents to a warehouse for finance analytics without loading the ERP.
- 04 Keep MES and WMS systems aligned with production orders and goods movements.
Common sync patterns
Where Bill handles billing: invoices land in SAP
Invoices and payment activity from the billing side post through to the enterprise system automatically.
Migration without a hard cutover
When one system is replacing the other, run both in parallel with records matching until the switch is complete.
One customer and vendor master
Where both systems keep records of the same organizations, corrections made in either propagate to the other.
What you can sync between Bill and SAP
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.
| Bill objects | SAP objects | How this pairing syncs | |
|---|---|---|---|
| Bills Accounts-payable amounts owed to vendors, with bill line items; read and created via /v3/bills and pulled incrementally by filtering on createdTime/updatedTime. | Business Partners The unified customer and supplier master in S/4HANA, the anchor object for CRM and procurement syncs. | Bills is specific to Bill and Business Partners to SAP — each maps to any object or custom field on the other side. | |
| Vendors Payee master records; synced two-way with vendor/supplier tables in an ERP or accounting system so new payees don't have to be re-keyed. | Materials (Products) Item master with plant and sales views, synced to commerce, PLM, and CRM systems. | Vendors is specific to Bill and Materials (Products) to SAP — each maps to any object or custom field on the other side. | |
| Invoices Accounts-receivable invoices sent to customers; created and read via /v3/invoices to keep billing status aligned with the ERP or CRM. | Sales Orders Order documents written from external channels and read for status and fulfillment. | Invoices is specific to Bill and Sales Orders to SAP — each maps to any object or custom field on the other side. | |
| Customers AR customer master records; mapped to customer/account records in a CRM or ERP so finance and sales share one view. | Purchase Orders Procurement documents synced with supplier portals and spend tools. | Customers is specific to Bill and Purchase Orders to SAP — each maps to any object or custom field on the other side. | |
| Payments Outgoing vendor payments and received customer payments; read for reconciliation and created to schedule bill pay. | Outbound Deliveries Shipment documents synced to WMS, carriers, and customer portals. | Payments is specific to Bill and Outbound Deliveries to SAP — each maps to any object or custom field on the other side. | |
| Chart of Accounts GL accounts used to code bills and invoices; typically mastered in the accounting system and written into BILL for consistent coding. | Billing Documents Invoices read for AR status and replicated for revenue reporting. | Chart of Accounts is specific to Bill and Billing Documents to SAP — each maps to any object or custom field on the other side. |
How changes propagate between Bill and SAP
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.
Bill SAP Sub-second propagation
DetectionBill notifies Stacksync of record changes through webhook events. Webhook event subscriptions (POST /v3/subscriptions) for bills, vendors, payments, invoices, and bank accounts, with polling on.
DeliveryEach detected change is written to SAP through its API, with automatic retries and rate-limit backoff.
SAP Bill Sub-second propagation
DetectionSAP notifies Stacksync of record changes through webhook events. Business events via SAP Event Mesh on S/4HANA.
DeliveryEach detected change is written to Bill through its API, with automatic retries and rate-limit backoff.
Rate-limit considerations
- Bill: 20,000 requests per developer key per hour; login (POST /v3/login) capped at 200/hour; maximum 3 concurrent requests per developer key per organization. Spend & Expense API is a separate token at 60 calls/token/minute.
- SAP: Throttling is configured at the gateway and tenant level rather than as a single published rate limit.
What ships with Bill ⇄ SAP
Connect Bill and SAP for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Bill–SAP connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Bill or SAP 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 Bill or SAP record.
Observability
Monitoring
Track your Bill ⇄ SAP sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Bill and SAP.
How the Bill and SAP connectors work
Bill
- Integration surface
- REST/JSON (BILL v3 Connect API)
- Authentication
- Session-based: POST /v3/login with username, password, organizationId, and a developer key (devKey) returns a sessionId that is passed with the devKey as headers on every subsequent call; OAuth is available for partner/embedded apps
- Change detection
- Webhook event subscriptions (POST /v3/subscriptions) for bills, vendors, payments, invoices, and bank accounts, with polling on createdTime/updatedTime list filters as the fallback
- Capabilities
- read · write · webhooks
- Rate limits
- 20,000 requests per developer key per hour; login (POST /v3/login) capped at 200/hour; maximum 3 concurrent requests per developer key per organization. Spend & Expense API is a separate token at 60 calls/token/minute.
SAP
- Integration surface
- OData (v2/v4) APIs on S/4HANA; BAPI/RFC and IDoc on ECC and on-prem systems; SOAP services
- Authentication
- OAuth 2.0 or basic auth via communication arrangements on cloud editions; SAP user credentials for RFC on-prem
- Change detection
- Business events via SAP Event Mesh on S/4HANA; change pointers with IDocs or timestamp polling on ECC
- Capabilities
- read · write · webhooks
- Rate limits
- Throttling is configured at the gateway and tenant level rather than as a single published rate limit
How it works
How to connect Bill to SAP — 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 Bill and SAP with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Bill
connected
SAP
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Bill and SAP 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 · Bill ⇄ SAPCustomers 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.
Bill SAPCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Bill and SAP integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Bill and SAP: authenticate both systems, choose the objects to sync (such as Bill's Bills and Vendors), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed Bill and SAP connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Bill–SAP integration in-house.
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Yes — Stacksync ships production-grade connectors for both Bill and SAP. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
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Change detection on Bill: Webhook event subscriptions (POST /v3/subscriptions) for bills, vendors, payments, invoices, and bank accounts, with polling on createdTime/updatedTime list filters as the fallback. On SAP: Business events via SAP Event Mesh on S/4HANA; change pointers with IDocs or timestamp polling on ECC. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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On the Bill side: Vendors, Invoices, Customers, Payments, plus custom fields where Bill exposes them. On the SAP side: Purchase Orders, Outbound Deliveries, Billing Documents, GL Accounts and Journal Entries. Stacksync auto-detects both schemas and converts types between the two systems.
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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.
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.
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:
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