Connect Every System Your Business Depends On
Reliable, production-grade integrations — payment processing, CRM sync, communication platforms, databases, and AI services. Starting at $3,000 per integration.
Professional API Integration Services
Connect your systems together with professional API integration services. Payment processing, CRM sync, communication platforms, databases — starting at $3,000 per integration. Every connection includes robust error handling, retry logic, monitoring, and documentation because third-party APIs go down, and your business can't afford data loss.
Possibility Engineering builds custom API integrations on our global edge network for sub-50ms response times and automatic scaling. Whether you're connecting Stripe to your accounting system, syncing data between Salesforce and your platform, or building a real-time notification pipeline across Slack, email, and SMS, we deliver integrations that are reliable, maintainable, and built for the real world — not just the happy path.
APIs We Connect Every Day
From payment processing to AI inference, we integrate the tools and platforms your business depends on. Here are the categories we work with most frequently.
Payment APIs
Stripe, PayPal, Square
- Payment processing and checkout flows
- Subscription billing and recurring revenue
- Refund handling and dispute management
- Webhook event processing and reconciliation
CRM Integration
Salesforce, HubSpot, Pipedrive
- Contact and lead synchronization
- Deal tracking and pipeline automation
- Custom field mapping and data transformation
- Activity logging and event triggers
Communication APIs
Slack, Microsoft Teams, SendGrid, Twilio
- Real-time notifications and alerts
- Email delivery and template management
- SMS and voice messaging
- Chat bots and interactive messages
Database Integration
PostgreSQL, MongoDB, Turso
- Cross-database data synchronization
- ETL pipelines and data transformation
- Read replicas and query optimization
Cloud Storage
Edge Object Storage, AWS S3, Google Cloud Storage
- File upload, download, and streaming
- Image processing and transformation
- Cross-provider storage migration
AI/ML Services
OpenAI, Anthropic, Edge AI
- LLM integration for text generation and analysis
- Embedding generation and semantic search
- Image recognition and classification
- Tool-use and function calling interfaces
How We Approach API Integration
A structured process that ensures reliable, maintainable integrations. Every integration is built to handle failures gracefully — because third-party APIs will break, and your systems need to keep running.
Discovery and Audit — 1–2 days
We map all systems involved in the integration: APIs, databases, authentication methods, data formats, rate limits, and SLAs. We identify potential failure points, data inconsistencies, and security requirements. This phase produces a detailed integration map and risk assessment that guides every decision in the build phase.
Architecture Design — 1–2 days
We design the integration architecture: data flow diagrams, error handling strategies (circuit breakers, dead letter queues, retry policies), data transformation and mapping rules, and monitoring approach. You approve the architecture before we start building. We design for the unhappy path first — making sure failures are handled gracefully before we optimize the success case.
Build and Test — 1–3 weeks
We implement each integration with thorough error handling, retry logic with exponential backoff, data validation, and transformation pipelines. Every integration is tested in isolation first, then tested as part of the complete data flow. We simulate real-world failure scenarios: API timeouts, rate limit exceeded responses, malformed data, authentication failures, and network partitions.
Deploy and Monitor — 1 day
Production deployment on our global edge network with real-time monitoring dashboards, alerting for any integration failures, and detailed logging for debugging. We verify data accuracy across all connected systems post-launch and run a 48-hour stabilization period where we actively monitor every data flow before handing off to your team.
API Integration Pricing
Clear, upfront pricing based on the number and complexity of integrations. Every tier includes error handling, monitoring, and documentation — no hidden fees.
- 1 third-party API integration
- Authentication and credential management
- Retry logic with exponential backoff
- Data validation and transformation
- Monitoring, alerting, and logging
- Integration documentation
- 3–5 business days delivery
- 3–5 API integrations connected
- Custom integration middleware layer
- Data transformation and mapping
- Event-driven architecture with webhooks
- Circuit breakers and dead letter queues
- Load testing and reliability verification
- Centralized monitoring dashboard
- 2–4 weeks delivery
- Unlimited integrations across all systems
- Custom API gateway and routing layer
- Real-time monitoring and observability dashboard
- Data pipeline orchestration
- Compliance and security audit
- SLA with dedicated support engineering
- CI/CD deployment with staging environments
- 1–3 months delivery
Not sure what you need? See our API cost guide or talk to us for a free assessment.
API Integration FAQ
Common questions about our API integration services. Don't see your question? Reach out and we'll answer directly.
Connect Your Systems
Tell us which APIs you need to connect. We'll map out the integration architecture and give you a clear, no-surprise quote within 24 hours.