Enterprise Integration & APIsConnect your systems so data is entered once and trusted everywhere.
We integrate ERP, CRM, accounting, commerce, payments and messaging into one reliable flow, built on documented APIs. Every integration is monitored and retried, so failures surface first.
- Official APIs first
- Monitored and retried
- Documented handover
Free 30-minute call with a senior integration architect. Reply within one business day. Based in Jaipur, working with businesses across India.
- Discovery callFree 30 minutes with a senior specialist
- Scoped first phaseWritten scope, timeline and fixed price
- Build with weekly demosWorking software you can see every week
- Launch and supportGo-live with your team ready, then ongoing support
What are enterprise integration and API services?
Enterprise integration connects the business systems you already use, such as ERP, CRM, accounting, e-commerce, payment gateways and WhatsApp, so data moves between them automatically. Stack18 maps your systems, designs the APIs and sync rules, builds monitored integrations and documents them for your team.
Last reviewed 9 November 2026 by the Stack18 delivery team in Jaipur. Security and AI governance · Pricing · About Stack18
| What it covers | Integration assessment; ERP, CRM & accounting sync; Commerce & logistics APIs; Payments & compliance APIs; Messaging channel APIs; API development & management. |
|---|---|
| Typical first step | Integration Assessment: 1–2 weeks; fixed price. |
| Next step | Integration Build: 3–6 weeks per system; fixed price. |
| Long-term option | Integration Care: ongoing; monthly retainer. |
| Measured by | Manual re-entry; Sync success rate; Order-to-invoice time; Stock accuracy. Each against an agreed baseline. |
| Governance | Human approval at 5 governance gates before anything reaches production. NDA available on request. |
| Delivery team | Based in Jaipur, India. A senior specialist replies within one business day. |
You need Enterprise Integration & APIs when…
Tap the ones that apply to you.
Enterprise Integration & APIs, end to end.
Each capability is delivered by the same team on the Agentic SDLC, with your approval at every critical step.
Integration assessment
A map of your systems and a clear design before anything is built.
- System and data-flow map
- Source-of-truth decisions
- Build, buy or middleware options
ERP, CRM & accounting sync
Sales, stock and finance systems that agree with each other.
- Tally, Busy, SAP B1, Zoho and more
- Master data and sync rules
- Two-way updates with conflict handling
Commerce & logistics APIs
Orders, inventory and shipments flowing between storefronts, marketplaces and couriers.
- Shopify, WooCommerce, marketplaces
- Courier and tracking APIs
- Inventory and order sync
Payments & compliance APIs
Collect, reconcile and report without manual steps.
- Payment gateway integration
- GST e-invoice and e-way bill APIs
- Automated reconciliation
Messaging channel APIs
Reach customers where they are, from your own systems.
- WhatsApp Business API
- SMS and email gateways
- Templates, consent, delivery tracking
API development & management
Your own APIs: secure, versioned and documented.
- REST and webhook APIs
- Authentication and rate limits
- Developer documentation
A typical integration engagement, week by week.
Senior people lead every phase. Specialised AI agents on the Agentic SDLC handle the repetitive work, and nothing ships without your approval.
Map
Inventory systems, data owners and the flows that hurt most.
Design
Agree sources of truth, data mappings, error handling and security.
Build & test
Build connectors, test real data in a sandbox, handle edge cases.
Go live & monitor
Switch over with monitoring, alerts and runbooks for your team.
Start small. Scale when it works.
Every engagement begins with a short, fixed-price step so you can judge the fit before committing further.
Integration Assessment
Teams with several systems that do not talk to each other.
- Duration
- 1–2 weeks
- Pricing
- Fixed price
- System and data-flow map
- Recommended architecture
- Costed build plan
Integration Build
Teams ready to connect specific systems.
- Duration
- 3–6 weeks per system
- Pricing
- Fixed price
- Connector build and testing
- Monitoring and alerts
- Documentation and handover
Integration Care
Live integrations that need to stay healthy.
- Duration
- Ongoing
- Pricing
- Monthly retainer
- Monitoring and fixes
- API change management
- Quarterly review
Free integration map
List the systems you use and where data gets re-entered. A Stack18 integration architect sketches what should connect to what, and in what order.
- One-page connection map
- Quick wins and risks
- Suggested sequence, no obligation
We agree targets before we start.
Every engagement has a baseline and a target on the measures that matter to you, reported at every read-out.
Where Enterprise Integration & APIs makes the biggest difference.
Distribution company
- Challenge
- Orders keyed into Tally by hand from three channels.
- What we do
- Order and invoice sync between the dealer portal, the ERP and Tally.
5 weeks
D2C brand
- Challenge
- Overselling because stock differs between store and marketplaces.
- What we do
- Inventory and order sync across the storefront, marketplaces and couriers.
6 weeks
Mid-size manufacturer
- Challenge
- Finance reconciles payments and e-invoices manually each month.
- What we do
- Payment gateway, e-invoice and e-way bill integration with the ERP.
4 weeks
Enterprise Integration & APIs questions.
Do you use middleware or build custom integrations?
We recommend whichever fits. Where a reliable connector or platform already exists we use it, and where it does not we build. The design shows the trade-offs before you commit.
What happens when a system changes its API?
Integrations are built with versioning, tests and monitoring so changes are caught early. Under an Integration Care retainer we handle updates for you.
How do you keep data accurate across systems?
We agree one source of truth for each type of data, define sync rules and conflict handling, and add reconciliation checks and alerts.
Can you integrate Tally, SAP Business One or Zoho?
Yes. We have dedicated capability pages for Tally, Busy, SAP Business One and Zoho integration, among others, and we work through each product's supported interfaces.
Is the integration secure?
We use authentication, least-privilege access, encrypted transport and audit logs, and we document data flows so you can review them.
Do you provide enterprise integration and API services in Jaipur and across India?
Yes. Stack18 is headquartered in Jaipur, Rajasthan, and delivers enterprise integration and API services for businesses across India. You get a free 30-minute call, a fixed-price first step and working software every week, so the engagement works the same whether you are in Jaipur or elsewhere.
Often combined with.
Integration is usually part of a bigger change. Pair it with enterprise software development, legacy modernization to bring old systems online, cloud and DevOps for the platform underneath and CRM and marketing automation for customer data. More integrations: Shopify, Unicommerce, Amazon and Flipkart, courier APIs, WooCommerce, Magento and Busy. See all Stack18 services.
Enterprise Software Development
Enterprise software that meets the bar for scale, security and audit.
Explore →ModernizationLegacy Modernization
Retire technical debt without stopping the business.
Explore →ModernizationCloud & DevOps
Ship faster on cloud you can trust, and afford.
Explore →Let's scope your Enterprise Integration & APIs project.
Tell us where you are and where you want to be. A senior integration architect will reply within one business day with next steps.
- Free 30-minute consultation
- Indicative estimate after the call
- NDA available on request