Software Integration Services
API, payment, banking, courier, ERP and AI integrations that connect your systems, with rates from $35 per hour.
Integrations Live in Production
We connect software to Stripe, PayPal, Plaid, FedEx, DHL, TCS, M&P and many other services, with secure APIs, retries and monitoring.
Stripe, PayPal, Plaid and open-banking APIs.
FedEx, DHL, TCS and M&P booking and tracking.
Two-way data sync and large language model APIs.
Software Integration Services
Secure REST and GraphQL APIs for your integrations.
Checkout, subscriptions, refunds and payouts.
Booking, labels, tracking and status updates.
Orders, invoices, customers and stock in sync.
LLM features inside your product.
Alerts, logs and updates when providers change.
Connect Your Systems with Three Circle
Tell us which systems need to talk to each other. We will map the data and give you a clear plan and quote.
What We Connect
The integrations businesses ask us for most often:
Payments
Stripe, PayPal and other gateways.
Couriers
FedEx, DHL, TCS, M&P and other carriers.
Business Systems
ERP, accounting, CRM and AI services.
Why Choose Three Circle for Software Integration?
We build integrations as part of the products we deliver, from courier ERPs to fintech and restaurant platforms, so we know what breaks in production and how to prevent it.
Real Integrations:
Payments, banking and couriers live in production.
Full-Stack Team:
ASP.NET Core, Node.js, Python and PHP back ends.
Ongoing Support:
Monitoring and updates after launch.
Clear Pricing:
Rates from $35 per hour, projects from $1,000.
Transparent Communication:
Regular demos, clear reports and honest estimates.
Reliable Delivery
Clear milestones keep your project on schedule.
Software Integration Services
Three Circle connects your software to the payment, shipping, banking, accounting and AI services your business runs on. We build integrations as secure APIs with retries, logging and monitoring, so data moves reliably between systems. Our integrations are live in production today, from courier ERPs connected to FedEx, DHL, TCS and M&P to payment flows on Stripe, PayPal and Plaid.
Payment Integrations
Stripe, PayPal and other payment gateways for checkout, subscriptions, refunds and payouts.
Banking and Open-Banking APIs
Plaid and open-banking APIs for account linking, balances and transactions in fintech products.
Shipping and Courier Integrations
Carrier APIs such as FedEx, DHL, TCS and M&P for booking, labels, tracking and status updates.
ERP, Accounting and CRM Integrations
Two-way sync of orders, invoices, customers and stock between your platform and the systems your teams already use.
AI and LLM Integrations
Large language model APIs for chat, search, document analysis and recommendations inside your product. See our AI chatbot development services.
Hardware and Bluetooth Integrations
Apps that connect to devices and sensors over Bluetooth Low Energy. See Bluetooth app development.
How We Build Integrations That Keep Working
- Map the data: which system owns each record, what moves where, and how often.
- Design the API layer: one secure integration service rather than code scattered across your app.
- Handle failures: retries, queues and alerts, so a provider outage does not lose orders or payments.
- Test with sandboxes: provider test environments before anything touches live data.
- Monitor after launch: logs and alerts, and updates when a provider changes its API.
Integrations We Have Built
Stallionex: Courier ERP Connected to FedEx, DHL, TCS and M&P
An ASP.NET Core ERP and client portal that books shipments, prints labels and tracks parcels through four carrier integrations, live in production. Read the case study.
Multi-Branch Restaurant Ordering and POS Platform
Online ordering, POS, menus, payments and inventory in one platform used by 5+ restaurants. Read the case study.
MomoMi: Blockchain Crypto Wallet with Node.js and LLM Features
MomoMi is a sleek, dark-mode crypto wallet and finance app for secure digital-asset transactions on a smartphone. We built it with a Node.js back end, blockchain integration for wallet transactions and AI features powered by a large language model (LLM).
Sport Betting IQ: AI and LLM-Powered Flutter Sports App
Sport Betting IQ lets fans track their favourite sports, follow real-time scores and get intelligent insights. We built it with Flutter, an ASP.NET Core back end and AI features powered by a large language model (LLM).
Want results like these? Tell us about your integration project and get a free consultation.
Software Integration Cost
Our rates start from $35 per hour, and projects start from $1,000. The cost of an integration depends on how many systems are involved, whether data flows one way or both ways, and how much error handling and reporting you need. A single payment or shipping integration costs far less than a two-way ERP sync, so we give you a written estimate after a short discovery call.
See custom software development cost for wider budgets, or hire dedicated developers for ongoing integration work.
Software Integration Engagement Models and Pricing
Choose the way of working that fits your budget and timeline:
Fixed-Price Projects
Best for MVPs and projects with a clear scope. You agree on price, timeline and features before development starts.
Time and Materials
Flexible for products that will evolve. You pay for actual development time and can change priorities after every sprint.
Hire Dedicated Integration Developers
Add experienced integration developers, designers and QA engineers to your team on a monthly basis for long-term development.
Want a quick budget? Use our app development cost calculator or request a free estimate.
Ready to Connect Your Systems?
Book a free consultation and get a clear plan and quote for your integration.
- FAQs
Frequently Asked Questions
Building secure connections between your software and other systems, such as payment gateways, banking APIs, couriers, ERPs, CRMs and AI services, so data moves between them automatically.
We have built integrations with Stripe, PayPal and Plaid, and connect other payment gateways and open-banking APIs through their APIs.
Yes. Our Stallionex courier ERP is live with FedEx, DHL, TCS and M&P integrations for booking, labels and tracking.
Our rates start from $35 per hour and projects from $1,000. A single one-way integration costs much less than a two-way ERP sync; we give you a written estimate after discovery.
Yes. We review your system and the other platform’s API, then build the integration as a separate, secure service that does not disrupt your current users.
We monitor integrations after launch and update them when a provider releases a new API version or retires an old one.
Yes. We integrate large language model APIs for chat, search, document analysis and recommendations, as in our Sport Betting IQ and MomoMi apps.
Yes. We provide monitoring, fixes and updates so your integrations keep working as providers change.