Webhook infrastructure, sync engines, and auth flows that actually hold up in production. Most businesses don't need one giant platform — they need their existing tools to talk to each other reliably. 4xCode's API integration services connect payment processors, CRMs, AI APIs, and internal systems through resilient webhook infrastructure and sync engines built to handle real-world failure modes: dropped webhooks, rate limits, schema drift, and partial failures. We've integrated everything from Stripe and Salesforce to custom internal APIs, and we build every integration assuming the third-party API will fail eventually — because it will.
Flexible, efficient data fetching across integrated systems.
Straightforward, widely compatible API integration.
Secure, standards-based authentication and authorization.
High-performance service-to-service communication.
Core Philosophy
We design every integration assuming failure, with retries, dead-letter queues, and monitoring — not happy-path-only code.
We've worked with most major payment, CRM, and AI provider APIs, so we already know their quirks and rate limits.
Integrations are documented and monitored so issues surface as alerts, not as angry customer emails three weeks later.
Capability Matrix
Reliable webhook ingestion with retry logic, deduplication, and dead-letter handling so events never silently disappear.
Bidirectional data sync between systems with conflict resolution, not just one-way data dumps.
OAuth, API key, and token-based auth flows built securely and maintained as providers change their requirements.
Custom internal SDKs so your team can integrate with your own APIs as easily as a third party would with theirs.
Engineering Stack
Operational Delivery Flow
Mapping explicit schema properties and planning strict network traffic filters.
Deploying resilient exponential backoff job setups to preserve operational states.
Testing systems against high concurrency requests to ensure strict transactional reliability.
Technical Validation
"We design every integration assuming failure, with retries, dead-letter queues, and monitoring — not happy-path-only code."
"We've worked with most major payment, CRM, and AI provider APIs, so we already know their quirks and rate limits."
"Integrations are documented and monitored so issues surface as alerts, not as angry customer emails three weeks later."
Adjacent Capabilities
Tell us the goal. We'll tell you the path.