Re-keying between systems
Staff manually copy the same data between your website, spreadsheets, and accounting.
API Development & Integrations
Connect Your Systems. Stop Re-Typing Data.
Custom APIs and integrations that make your software work together — orders, payments, CRM, accounting, and government services — so data flows automatically instead of through copy-paste.
APIs and integrations that make your systems talk
Most businesses don’t have a software problem — they have a disconnection problem. Orders live in one tool, payments in another, accounting in a third, and staff bridge the gaps by re-typing the same data all day.
We fix that two ways: we build custom APIs so your own software can connect cleanly, and we integrate the tools you already run — payments, CRM, accounting, e-commerce, logistics — so data flows automatically instead of through copy-paste.
Because we’re Singapore-based, we also handle the local connections that matter here: PayNow, Stripe, GST InvoiceNow (Peppol), and SingPass/Myinfo — with security and PDPA built in. See our guides on InvoiceNow and SingPass & Myinfo.
Sound familiar?
Manual exports and imports
Every report means exporting a CSV here and importing it there — slow and error-prone.
Tools that won’t talk
Each system holds part of the picture, and nobody sees the whole thing in one place.
What You Get
Everything connected, nothing manual
Custom API Development
Robust, documented REST APIs so your systems — and your partners — can connect cleanly.
Third-Party Integrations
Payment gateways, CRMs, accounting, e-commerce, logistics, and marketing tools.
Local & Government Services
PayNow, Stripe, and Singapore service integrations where your workflows need them.
Data Sync & Automation
Two-way sync and automated flows that replace manual exports and imports.
Webhooks & Real-Time Events
React to events the moment they happen — orders, payments, status changes.
Secure & Documented
Authentication, rate limiting, and clear documentation your team can rely on.
What We Build
From custom APIs to government-service connections
If it has an API, we can connect it — and where it doesn’t, we find the safe path.
Custom API Development
Robust, documented REST APIs so your systems — and your partners — can connect cleanly and securely.
Third-Party Integrations
Payment gateways, CRMs, accounting, e-commerce, logistics, and marketing tools, wired into your workflow.
Singapore & Government Services
PayNow, GST InvoiceNow (Peppol), SingPass/Myinfo, and other local services where your operations need them.
Data Sync & Automation
Two-way sync and automated flows that replace manual exports, imports, and re-keying for good.
Webhooks & Real-Time Events
React the moment something happens — a new order, a payment, a status change — instead of polling.
Legacy & No-API Systems
Database-level integration, file/SFTP exchange, or controlled automation when a system has no API of its own.
How We Work
How an integration gets done
- 1
Map the systems
We audit the tools involved, the data that moves between them, and where the manual work happens today.
- 2
Design the integration
We choose the cleanest, most maintainable approach — API, webhook, sync, or middleware — and define the data contract.
- 3
Build & test
We build with authentication, error handling, and rate limiting, then test against real data and edge cases.
- 4
Document & hand over
Every API and integration ships with clear documentation your team or any future developer can rely on.
- 5
Monitor & maintain
We watch for failures and API changes on the services you depend on, and keep the connection healthy.
Tech & Approach
Built to be secure and documented
Integrations fail quietly — so we build them to be observable, recoverable, and well-documented.
APIs
- REST
- GraphQL
- Webhooks
- OpenAPI docs
Auth & security
- OAuth 2.0
- API keys
- Rate limiting
- Audit logging
SG & payments
- PayNow
- Stripe
- InvoiceNow (Peppol)
- SingPass / Myinfo
Reliability
- Retries & queues
- Error handling
- Monitoring
- PDPA compliance
Why AppTech
Why integrate with AppTech
Singapore-service expertise
We’ve built the local connections — InvoiceNow, PayNow, SingPass/Myinfo — that overseas teams often get wrong.
Documentation as standard
Every integration ships documented, so you’re never locked into us to make a change.
Security & PDPA first
Authentication, encryption, rate limiting, and audit logging on any flow touching personal data.
We build the whole stack
We also build the software behind your APIs, so integrations fit the system, not the other way around.
Maintained, not abandoned
APIs you depend on change; we monitor and maintain the connections so they don’t break silently.
No-API? Still possible
When a system has no API, we find the safest maintainable path rather than telling you it can’t be done.
Frequently Asked Questions
What systems can you integrate?
If it has an API, we can connect it — payment gateways, CRMs, accounting software, e-commerce platforms, logistics providers, and marketing tools. We also build the APIs for your own software so others can integrate with you.
Can you connect to software that has no API?
Often yes — through database-level integration, file/SFTP exchange, or controlled automation. We’ll assess the safest, most maintainable option for your specific systems during scoping.
Is it secure?
Yes — authentication, encryption, rate limiting, and audit logging are standard, following OWASP practices and PDPA requirements for any personal data that flows through.
Do you provide documentation?
Always. Every API and integration ships with clear documentation so your team — or any future developer — can work with it confidently.
How long does an integration take?
A single, well-documented integration is often a matter of weeks; a hub connecting several systems takes longer. We scope it precisely after mapping your systems, so you get a fixed quote, not a surprise.
Can you connect InvoiceNow, PayNow, or SingPass?
Yes — Singapore service integrations are a core part of what we do. We connect systems to GST InvoiceNow (Peppol), PayNow, Stripe, and SingPass/Myinfo, with the security and PDPA handling those flows require.
See what api development & integrations could look like in your business
Free workflow assessment — we map your current operations and show you exactly what to automate first.