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Financial Services
Tax Management Simplified
UX/UI DesignAutomation+3
API INTEGRATION
We your systems.
Seamless third-party API integrations - payment gateways, CRMs, webhooks, REST, GraphQL. Boost productivity and unlock new growth channels.
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Integration Pipeline
Secure, Reliable, Production-Ready
Every integration follows our proven pipeline: requirements analyzed, authentication configured, endpoints tested, and monitoring set up before going live.
API AuditRequirements / Documentation
Auth SetupOAuth / API Keys / RBAC
IntegrationREST / GraphQL / Webhooks
TestingSandbox / Edge Cases / Load
SecurityEncryption / Rate Limiting
Go LiveProduction / Monitoring / Alerts
Who is it for?
API integration solutions for every stage of growth
Whether you're connecting your first payment gateway or orchestrating complex multi-system workflows, we build integrations that scale with your business.
Startups
Ship faster with pre-built integrations. We connect payment gateways, auth providers, and essential third-party services so you can focus on building your core product instead of reinventing the wheel.
01Small and Medium-sized Enterprises
Streamline operations by connecting your CRMs, ERPs, and marketing tools. We build reliable integrations that eliminate manual data entry, reduce errors, and give your team a single source of truth.
02Enterprises
Architect complex multi-system workflows at scale. We design and implement enterprise integration strategies with API gateways, event-driven architectures, and comprehensive monitoring for mission-critical operations.
03WHAT WE DO
Popular API solutions we integrate
- 01
Payment Gateways
Integrate popular payment gateways like PayPal, Stripe, or Braintree to enable secure and convenient online transactions.
- 02
CRMs and Ticketing Systems
Integrate CRMs and ticketing systems like Zoho, Salesforce, HubSpot, or Zendesk to streamline customer data management and support processes.
- 03
Workflow Automation Tools
Integrate workflow automation tools like Zapier to automate tasks and streamline processes.
- 04
E-commerce APIs
Integrate e-commerce APIs to provide a seamless shopping experience for your customers. This can include inventory management, order processing, and product search capabilities.
- 05
Chat System APIs
Integrate chat systems like LiveChat, Intercom, or Zendesk Chat to improve customer communication and support.
- 06
Travel & Booking Integrations
Integrate APIs from popular travel and booking services to provide real-time availability and booking options for your customers.
- 07
Analytics & Marketing APIs
Integrate analytics platforms, marketing automation tools, and tracking systems to gain deeper insights into user behavior and campaign performance across all your digital touchpoints.
- 08
Custom API Development
When off-the-shelf APIs don't meet your needs, we design and build custom RESTful and GraphQL APIs with comprehensive documentation, versioning, and authentication for your platform.
Our Process
From requirements to seamless integration
Our structured API integration process ensures reliable, secure, and well-documented integrations.
Typical engagement: 10-14 weeks to first launch
AI-assisted engineering, human-led quality - we ship faster without cutting corners.
Typical engagement: 10-14 weeks to first launch
AI-assisted engineering, human-led quality - we ship faster without cutting corners.
Project Kickoff
Phase 1 of 5
1 weekWe catalog the systems that need to talk to each other, review the third-party APIs and their limits, and agree on scope and sequencing before integration work begins.
Deliverables
Signed ContractSystems & API InventoryIntegration BriefProject Board SetupDiscovery & Design
Phase 2 of 5
1-2 weeksWe design the integration architecture: data mappings, sync strategies, error handling, and rate-limit behavior, all documented before a single endpoint is wired.
Deliverables
Integration ArchitectureData Mapping SpecsError Handling DesignSecurity ReviewPrototype & Testing
Phase 3 of 5
1-2 weeksA proof of concept moves real data through the riskiest integration first, surfacing API quirks and edge cases while the plan is still cheap to change.
Deliverables
Working Proof of ConceptEdge Case InventoryAPI Quirk NotesRevised Integration PlanDevelopment
Phase 4 of 5
3-6 weeksEngineers build the integrations with retries, idempotency, and logging baked in, and test them against sandbox and live environments before anything touches production data.
Deliverables
Production IntegrationsRetry & Recovery LogicIntegration Test SuiteSandbox Validation ReportLaunch & Growth
Phase 5 of 5
2+ weeksWe deploy with monitoring on every connection, document each integration, and hand your team dashboards that show data flowing where it should, when it should.
Deliverables
Production DeploymentIntegration MonitoringPer-Integration DocumentationSupport Plan
INTEGRATION PARTNERS
APIs and platforms we integrate
We integrate with industry-leading APIs and platforms to extend your application's capabilities and streamline your business operations.
Stripe
PayPal
Zapier
- HubSpot
Salesforce
- Twilio
- Postman
Airtable
- Zoho
- Notion
- JotForms
- Cognito Forms
- OpenBank
- Swagger
GraphQL
WHY US
Why choose Design Key?
We value your time and work in sprints to make our work productive and easy to track. Our agile development processes ensure that the solution is delivered on schedule without compromising on quality.
Timely Delivery
We value your time and work in sprints to make our work productive and easy to track. Our agile development processes ensure that the solution is delivered on schedule without compromising on quality.
Rigorous Quality Assurance
Our QA engineers collaborate with developers and UI/UX designers for superior testing and quality control. Through rigorous testing protocols and efficient code, we guarantee smooth app navigation and maximum user goal attainment.
After-Launch Support
Our support doesn't stop when the work is done. We can continue to assist and check if the integrations perform well and meet the required metrics. After the launch, we can quickly fix any issues and make improvements.
Efficient Communication
Dedicated managers keep our clients consistently informed about the project status and provide a clear view of every tech decision and its results.
Expert API Architecture
We design clean, well-documented API architectures with proper versioning, error handling, and rate limiting that stand the test of time and scale.
Security-First Integration
Every integration is built with security at its core — encrypted data in transit, secure token storage, and compliance with industry standards like PCI-DSS and SOC 2.
WHAT OUR CLIENTS SAY
Real results from real clients
0+Projects Delivered
0%Client Satisfaction
0+Team Members
0+Years Experience
"Daniel and his team have worked on several infrastructure development projects for me. They are excellent experts with exceptional client service and communication skills. Able to dig through complex project requirements and produce an end product that exceeds expectations."
Lori Barao
Manager of Operations, MMI Direct
Case studies
Real projects we've shipped
Recent projects we built for clients - each one shipped, in production, and serving real users.
FAQ
Questions? Answers.
Common questions about our API integration services.
Ready to get started?
Ready to connect your systems?
Schedule a 30-minute intro call with Daniel Killyevo, Founder and Technical Lead at Design Key. We'll discuss your integration needs and how to build seamless connections that power your business.
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