Accounting and Finance
QuickBooks, Xero, Sage, Zoho Books, FreshBooks, Wave, NetSuite
ERP system integration services · Free pilot
ERP integration services for accounting, CRM, e-commerce and payments
We connect your ERP to the systems you already run, so orders, invoices, stock and customer records move between them automatically instead of being retyped.
If staff export from the ERP into QuickBooks, copy Shopify orders in by hand, or reconcile Salesforce and ERP customer lists in spreadsheets, you need integration rather than another system. Timeline Digital, a custom software development company founded in 2013 in Islamabad, provides ERP integration services that connect a custom-built ERP or a packaged one such as Odoo, NetSuite, Microsoft Dynamics or SAP Business One to QuickBooks, Xero, Salesforce, HubSpot, Stripe, Shopify, Amazon, FedEx, UPS and DHL, with retry-safe sync, reconciliation and monitoring.
What are ERP integration services?
ERP integration services connect your ERP software with the other tools your business depends on so data flows automatically between them. Instead of copy-pasting invoices from the ERP into QuickBooks, stock levels from Shopify into the ERP, or customer records from Salesforce into the CRM module, everything syncs, in real time or on a schedule, through APIs, webhooks, and message queues. Done right, integrations remove duplicate data entry, reduce re-keying errors, and give leadership one consistent view of the data.
New to the topic? Start with what ERP software actually is, then come back for how it connects to the rest of your stack.
Which integration page fits your situation?
The ERP is the centre of the problem: orders, invoices, stock or customers must move between the ERP and the systems around it.
ERP integration services (this page)
The systems to connect do not include an ERP, such as CRM to accounting or a portal to a payment provider, or a system needs an API built for it.
Systems and API integrationMany systems across departments need one governed integration layer, with shared data contracts and central monitoring.
Enterprise integration architecture
What systems can you integrate with an ERP?
You can integrate an ERP with most systems that expose a documented API or a reliable export: accounting tools like QuickBooks and Xero, CRMs like Salesforce and HubSpot, HRM and payroll platforms, POS and retail systems, e-commerce stores, shipping carriers, payment gateways, cloud collaboration suites, and BI tools. The nine categories below cover the tools we integrate with your ERP most often.
Using something not listed? We work with REST, GraphQL, SOAP and webhook-based APIs, provided the vendor documents them and grants access; where it does not, we look at exports, database access or file exchange.
CRM
Salesforce, HubSpot, Zoho CRM, Pipedrive, Microsoft Dynamics 365
HRM and Payroll
BambooHR, Workday, Gusto, ADP, Rippling, Sage People
POS and Retail
Shopify POS, Square, Clover, Lightspeed, Toast, Timeline POS
E-Commerce
Shopify, WooCommerce, Magento, Amazon Seller Central, eBay, BigCommerce
Shipping and Logistics
FedEx, UPS, DHL, ShipStation, EasyPost, Shippo, SAP TM
Payment Gateways
Stripe, PayPal, Adyen, Braintree, Razorpay, Square Payments
Cloud and Collaboration
AWS, Azure, GCP, Microsoft 365, Google Workspace, Slack, Teams
BI and Analytics
Power BI, Tableau, Metabase, Looker, Google Analytics 4, Mixpanel
Three integration approaches, and when to pick each
Point-to-Point
Direct API integration between two systems. Simplest and fastest to ship. Right choice when you have 1 to 3 integrations total.
Best for: Small teams, limited integration count
Event-Driven
Asynchronous events through a message queue or event bus. Retry-safe, scalable, decoupled. Right choice when you have 5+ integrations or need real-time sync.
Best for: Growing mid-market companies
Middleware or iPaaS
Platforms like MuleSoft, Zapier, or Make handle the orchestration. Faster to start, but adds another vendor to depend on. Right choice for non-technical teams with many lightweight integrations.
Best for: Operations-led integrations at scale
How to choose in practice. Point-to-point is the right default when the map of your systems fits on a napkin: the ERP talks to QuickBooks, and maybe to Shopify, and that is it. Each connection is a small, self-contained piece of code that is quick to build and easy to reason about. The trap is growth: at five or six systems, every new tool needs a connection to several existing ones, and a change to the ERP's data model means touching every pipe at once.
Event-driven integration avoids that trap by decoupling the systems. When an order is created, the ERP publishes one event to a queue; the accounting sync, the shipping label job, and the BI pipeline each consume it independently. If the accounting API is down for an hour, its consumer simply catches up when it returns, and nothing else is affected. The trade-off is more infrastructure, a message queue, consumer workers, and monitoring, which is why it earns its keep at five or more integrations or wherever near-real-time sync matters.
Middleware and iPaaS platforms trade code for configuration. They shine when operations staff, not engineers, own the integrations, and when the flows are lightweight, moving a form submission into the CRM, or a CRM update into a spreadsheet. For high-volume, transactional ERP data, per-task and per-connector limits usually make a coded integration the more dependable choice within the first year or two.
ERP integration approaches at a glance
| Question | Point-to-point | Event-driven | Middleware or iPaaS |
|---|---|---|---|
| Best for | 1 to 3 integrations in total | 5 or more integrations, or near-real-time sync | Many lightweight flows owned by operations staff |
| How it works | Direct API calls between two systems | The ERP publishes events to a queue; each system consumes them independently | A platform such as MuleSoft, Zapier or Make orchestrates the flows |
| When one system is down | Retries with backoff; that one connection waits | Messages wait in the queue and catch up when the system returns | Depends on the platform’s retry and error handling |
| Adding a new system | Another connection to build, often to several systems | A new consumer of existing events | A new flow configured in the platform |
| Running cost | Your hosting only | Hosting plus a message queue and monitoring | A platform subscription, often priced per task or connector |
| Who maintains it | Engineers | Engineers | Operations or IT staff, with engineers for complex flows |
Key facts: ERP integration services at Timeline Digital
- Provider
- Timeline Digital, a custom software development company founded in 2013 and headquartered in Islamabad, Pakistan
- ERPs we connect
- Custom ERPs and packaged ones such as Odoo, NetSuite, Microsoft Dynamics and SAP Business One, through documented APIs, webhooks or reliable exports
- Track record
- 1,500+ projects for 860+ clients; 1,200+ developers and 85+ management professionals, including group-company employees
- Schedule
- There is no fixed timeframe: the schedule is set from your requirements in the Plan step. The free pilot of 2 to 3 key modules is ready in about 2 days, and with 1,200+ developers we have the capacity to deliver a complete system in as little as 2 weeks.
- Pricing
- Timeline Digital does not publish prices for custom software, because every project is custom. The price is agreed after requirements analysis and the free pilot.
- Ownership
- Integration source code, mapping documents and runbooks transfer to you on full payment.
What happens when a sync fails?
Every integration fails eventually: an API rate limit, an expired token, a vendor outage, a record that breaks a validation rule. The difference between a good integration and a liability is not whether it fails, it is whether the failure is visible, recoverable, and impossible to double-post.
Retries that cannot double-post
Failed calls are retried with exponential backoff, waiting longer between each attempt so a struggling API is not hammered. Every write carries an idempotency key, so if the same invoice is submitted twice because a response timed out, the receiving system records it once. Without this, retries silently create duplicate invoices and double-counted stock.
Dead-letter queues, not silent drops
A record that still fails after its retry budget, usually because the data itself is bad, moves to a dead-letter queue with the full error attached. Someone is alerted, the record is fixed or excluded deliberately, and nothing disappears without a trace. The worst integrations are the ones that skip bad records quietly and let the books drift.
Scheduled reconciliation
Real-time sync catches events as they happen; reconciliation catches everything it missed. A scheduled job compares record counts and totals between the two systems, yesterday's invoice total in the ERP against yesterday's total in the ledger, and flags any gap before month-end close finds it the hard way.
Monitoring and alerting
Queue depth, error rate, and time-since-last-successful-sync are tracked per connection, with alerts when any of them drifts. An integration that has quietly stopped is the most expensive kind of failure, because every day it stays unnoticed adds a day of catch-up and correction.
Two worked examples
The same engineering pattern, applied to the two integrations we are asked about most often.
ERP to QuickBooks: ledger sync
The goal is simple to state: every invoice, payment, and credit note raised in the ERP appears in QuickBooks once, in the right account, without anyone retyping it. The build starts with mapping, matching the ERP's items, tax codes, and customers to QuickBooks accounts and entities, and deciding the rules for records that exist in one system but not the other. Sync then runs on posted transactions: when an invoice is finalized in the ERP, a worker pushes it to the QuickBooks API with an idempotency reference tied to the ERP invoice number, so a retried push can never post twice.
The part that separates a reliable ledger sync from a fragile one is reconciliation: a nightly job totals each day's postings on both sides and flags any difference, so a mismatch surfaces the next morning rather than at month-end close. Edge cases are handled as policy decisions made with your accountant, not silent code defaults: partial payments, multi-currency invoices, voids and refunds after posting each get an agreed, documented rule.
ERP to Shopify: stock sync
Here the flow runs both ways. Downstream, a Shopify order webhook decrements ERP stock and creates the sales record within seconds of checkout. Upstream, goods received, transfers, and adjustments in the ERP push new available-to-sell quantities back to Shopify, so the store never sells stock that was just counted out. SKU mapping is the foundation, including bundle products that consume several ERP items per sale.
The hard problem is the race condition: two channels selling the last unit in the same minute. The integration treats the ERP as the source of truth, applies a configurable safety buffer on fast-moving SKUs, and confirms oversold orders against real stock before they reach the warehouse. Webhooks are backed by a scheduled full-quantity comparison, because a single missed webhook is invisible until a customer orders something that is not there. Failures land in the same dead-letter-and-alert pipeline described above, so a dropped update is a ticket, not a mystery.
Both examples assume a custom ERP, but the same patterns apply when we connect Odoo, NetSuite, or Dynamics to your stack.
For the field-level detail behind two other common projects, read our guides to ERP and CRM integration (customer master, quotes to orders, credit limits and invoices back to the CRM) and ERP and e-commerce integration (which system owns orders, stock, prices and returns for Shopify, WooCommerce and Amazon).
How does ERP integration work?
ERP integration follows the same five steps as every Timeline Digital project: Understand, Plan, Select Technology, Pilot, and Build & Scale. We map every data field between your systems before anything is built, because skipped mapping is a common reason integrations fail. The free pilot builds the 2 to 3 most important flows first so you can check the data on both sides, and Build & Scale adds the remaining flows with idempotent workers and retry logic, end-to-end tests on production-equivalent data, cutover with historical backfill, and monitoring for API changes.
Step 1: Understand
We learn how your business works.
Your requirements, workflow, challenges and goals, understood before anything is recommended.
Step 2: Plan
We design the right solution around your workflow.
Modules, workflows, roles, approvals, reports and integrations, agreed before development.
Step 3: Select Technology
Choose the right technical foundation.
Technology options matched to your users, security, budget and growth, not one fixed stack.
- Free pilot
Step 4: Pilot
Test our work before full project development.
Free. You choose 2 to 3 key modules and we build them first, so you can judge our work.
The full project starts only after you approve the pilot.
- Full project
Step 5: Build & Scale
From approved pilot to complete digital system.
Full development, testing, deployment, training and support, built to grow with you.
What we need from your side
Integration timelines are set more by access and decisions than by code. These stay with your organization.
- API access and credentials for the ERP and each connected system, ideally through a dedicated service account
- Contacts at each vendor, including your ERP partner if you have one, for access, limits and approvals
- Test or sandbox environments for the ERP and the connected systems, or an agreed safe way to test
- Data owners, such as your accountant for ledger mapping and operations for stock and SKUs, to agree mappings and sign off reconciliations
- Decisions on which system owns each record type, and on policy questions such as refunds, voids and multi-currency
Guides for this decision
In-depth, practical reading for teams planning this kind of project.
- Guide · 8 min readERP and E-Commerce Integration: Shopify, WooCommerce and AmazonERP and e-commerce integration keeps orders, stock, prices and returns consistent between your online channels and your back office. This guide covers which system should own each record, sync patterns, platform API basics and a test checklist.Read the guide
- Guide · 7 min readERP and CRM Integration: What to Sync and HowERP and CRM integration lets sales see credit, orders and invoices while finance gets clean customer records and accurate orders. This guide sets out what to sync, which system owns each field, sync patterns and pitfalls.Read the guide
- Guide · 10 min readSystem Integration Approaches: Point-to-Point, Middleware, iPaaS or Events?Point-to-point APIs, middleware, iPaaS, event-driven and file-based integration each fit different situations. This guide compares them, then covers the decisions that matter more than the pattern: system of record, idempotency, retries, error queues, reconciliation and security.Read the guide
Free pilot
See your most important ERP data flows working before you commit
Before you commit to the full project, we build 2 to 3 of your key modules as working software, free of charge, ready in about 2 days. Your team tests the pilot, and the full build starts only after you approve it.
See how the free pilot worksUnderstand
We learn your requirements and how your organisation works today.
Select pilot modules
Together we choose 2 to 3 key modules that prove the solution.
Build the working pilot
We build those modules as real, working software, free of charge.
You test it
Your team uses the pilot. The full project starts only after you approve it.
ERP integration services FAQs
What are ERP integration services?
ERP integration services connect your ERP with the other systems your business runs, such as accounting, CRM, HR and payroll, POS, e-commerce, shipping, payment gateways and BI, so orders, invoices, stock and customer records move between them automatically. Done well, integrations remove duplicate data entry, keep figures consistent across systems and give leadership one set of numbers. Timeline Digital builds these integrations for custom ERPs and for packaged ones such as Odoo, NetSuite and Microsoft Dynamics.
What is the difference between ERP integration and ERP customization?
ERP customization changes how the ERP itself behaves. New modules, new fields, new workflows. ERP integration connects the ERP to other systems so data flows between them. Most projects involve both. Timeline Digital offers both as part of the same engagement.
How long do ERP integrations take to build?
There is no fixed timeframe: the schedule for your ERP integration is set from your requirements in the Plan step. The free pilot of 2 to 3 key modules is ready in about 2 days, and with 1,200+ developers we have the capacity to deliver a complete system in as little as 2 weeks. Long-term support under a service level agreement (SLA) follows launch. A one-way connection to a well-documented REST API is the quickest kind, and legacy SOAP services and on-premise systems take the longest. The full project starts after you approve the pilot, and the scope, milestones and terms are agreed after it.
What technologies are used for ERP integration?
We use REST APIs, GraphQL, webhooks, and message queues such as AWS SQS or RabbitMQ. For real-time sync we use event-driven architectures. For batch sync we use scheduled jobs with idempotent workers. We prefer native APIs over middleware when possible: fewer moving parts, fewer things to fail.
Can you integrate with legacy on-premise systems?
Yes. Many mid-market ERPs still connect to legacy databases such as Oracle, MSSQL or AS/400, or to SOAP APIs. We build secure bridges using VPN tunnels, middleware adapters, or direct database replication depending on the constraints.
What do you need from us for an ERP integration?
API access and credentials for the ERP and each connected system, ideally through a dedicated service account; contacts at each vendor, including your ERP partner if you have one; test or sandbox environments, or an agreed safe way to test; data owners who agree field mappings and sign off reconciliations; and decisions on which system owns each record type and on policy questions such as refunds, voids and multi-currency. What can be integrated, and how quickly, depends on the access each vendor allows.
How much do ERP integration services cost?
Timeline Digital does not publish prices for custom software, because every project is custom. The price is set in three steps: we analyse your requirements, build a free pilot of 2 to 3 key modules, and after you approve the pilot we agree the scope, milestones and commercial terms in writing. Any change request outside the approved scope is reviewed and agreed with you before extra work begins. The main cost drivers are the number of systems and data flows, whether each system has a documented API, one-way or two-way sync, data volumes, and how much historical data must be backfilled.
Can you integrate SAP, Oracle, Microsoft Dynamics or NetSuite with other systems?
Yes, where the platform provides documented APIs, web services or reliable exports and your licence permits the access. We connect these ERPs to CRMs, e-commerce stores, payment and shipping services, banks and reporting tools, and we can build custom middleware between them. Timeline Digital is not a certified partner of SAP, Oracle, Microsoft or NetSuite; where a change must be made inside the ERP itself, we work alongside your ERP partner.
How do you keep credentials and data secure during an integration?
Each connection uses its own scoped service account rather than a personal login, credentials are stored in a secrets manager and never in code, data is encrypted in transit, and every exchange is logged. An NDA can be signed before you share sensitive details, and access is removed at the end of the engagement if you ask.
Who owns the integration code?
You do, on full payment: the project source code, mapping documents and runbooks transfer to you, and your data is yours throughout. Commercial middleware or iPaaS subscriptions you choose stay licensed in your name.
Do you handle ERP migration as part of integration services?
Yes. When you move off SAP, Oracle, Odoo or NetSuite to a custom ERP, we handle data migration, historical record preservation, and a rehearsed cutover plan that keeps downtime short, usually scheduled outside business hours. The full rollout side of that work is covered on our ERP implementation services page.
Get your ERP integration planned
Tell us which systems you need connected and what data should flow each way. We map the fields with you, agree a written plan, and build the most important flows first as a free pilot.
Updated
About this page
Published by Timeline Digital, a custom software development company founded in Islamabad in 2013. The integration patterns described here are the ones we build; the facts on track record, schedule, pricing policy and ownership come from the same company facts used across the site.
Author
Usama Asif
CEO and CTO, Timeline Digital. Founded the company in 2013 and has led its ERP and integration work since then.