Services · 09
API and systems integration for connected products
We connect the systems you already use with clear contracts, retries, and monitoring.
Modern products rarely live in isolation. They pull customer records from a CRM, charge through a payment provider, sync inventory from an ERP, and react to webhooks from half a dozen services. Each connection is simple in a demo and fragile in production—timeouts, duplicate events, partial failures, and auth token expiry are where integrations actually fail.
We treat integrations as product infrastructure, not one-off scripts. That means explicit contracts between your app and each external system: what triggers a sync, how idempotency is handled, what happens when the third party is down, and how operators know something broke. Webhooks get verification, retries get backoff, and dead-letter paths prevent silent data loss.
Internal APIs between your own services get the same discipline. As monoliths split or mobile clients need dedicated backends, unclear boundaries create duplicate logic and conflicting sources of truth. We design service interfaces, auth models, and sync jobs so teams can evolve parts of the stack without breaking dependents.
Payment integrations deserve extra care—checkout flows, refunds, subscription lifecycle, and webhook reconciliation affect revenue directly. We document auth, test modes, and failure handling so finance and engineering share the same picture of what “paid” means in your database versus the provider’s dashboard.
Whether you are connecting Stripe for the first time, syncing Salesforce or HubSpot records, feeding GPS data into a dispatch board, or building the API layer for a mobile field app, the outcome is connected systems you can operate— with logs, retries, and runbooks instead of tribal knowledge in one engineer’s head.
Problem we solve
Point-to-point integrations become brittle and hard to debug as tools multiply.
Ideal for
Products that depend on payments, CRM data, external platforms, or reliable sync between mobile clients and back-office systems.
Use cases
Concrete examples of how teams use this service.
Payment checkout and subscription billing
Stripe or similar providers wired for checkout, refunds, and webhook reconciliation so payment state in your app matches the provider ledger.
CRM sync for sales and support
Bi-directional or one-way sync between your product and CRM—contacts, deals, tickets—with conflict rules and failure alerts when sync stalls.
Webhook ingestion at scale
Verified webhook endpoints, idempotent handlers, and queue-backed processing so burst traffic does not drop events or double-apply changes.
Mobile app backend and field sync
APIs for mobile clients with offline-friendly sync, photo uploads, and job status that land in the systems ops teams already use.
Third-party logistics and GPS feeds
Connect dispatch, fleet, or warehouse tools so job status and location data flow into your console without manual re-entry.
Healthcare reminders and scheduling hooks
Integrate SMS, email, and calendar systems around booking flows with clear failure paths when external delivery services lag or fail.
Deliverables
- Integration design and auth model
- Production connectors
- Failure and retry handling
- Ops documentation
- Webhook verification and replay strategy
- Monitoring hooks for sync health
What we build
- Payment provider integrations
- CRM and ERP connectors
- Webhook handling and sync jobs
- Internal APIs between services
- Idempotency, retries, and dead-letter handling
- Integration monitoring and ops documentation
Tech stack
REST, GraphQL, webhooks, Node.js, queue workers, OAuth and API key patterns
Industries we serve
How this service shows up in the industries we work with. See all industries.
What affects cost and timeline
- Number of external systems and quality of their APIs—undocumented or rate-limited APIs extend discovery and testing.
- Sync direction and conflict rules: one-way nightly jobs differ from real-time bi-directional sync with merge logic.
- Payment and billing complexity: one-time checkout vs. subscriptions, trials, and proration adds test surface.
- Webhook volume and idempotency requirements under peak load.
- Security and compliance constraints for tokens, scopes, and data residency.
- Your team’s availability to provide sandbox credentials, sample payloads, and business rules for edge cases.
For a directional band, use the project cost estimator, then we refine on a call.
Why work with Apexic
- Integrations ship with retries, monitoring, and ops docs—not demo scripts that break on the first timeout.
- We design auth and idempotency up front so webhook storms and token refresh do not corrupt production data.
- Payment and CRM connectors follow patterns we have used on dispatch, retail, clinic, and field ops builds.
- Internal and external APIs share clear contracts so your team can add systems without spaghetti point-to-point code.
How engagements run
Discover, design, build, launch, and support, with clear checkpoints at every stage.
Discover
We align on outcomes, users, budget band, and technical constraints.
Design
We propose the architecture, UX direction, and delivery milestones.
Build
We ship in short cycles with demos, reviews, and tests.
Launch & support
We release carefully, then keep improving with a shared backlog.
Related work
Selected projects that used this service area.
Frequently asked questions
Do you integrate payment providers?
Yes. Payment flows are a common engagement, with auth models, webhooks, and failure handling documented for ops. We test checkout, refunds, and reconciliation paths before go-live.
Can you sync with our CRM or ERP?
Yes. We design connectors and sync jobs so data moves reliably between your product and the tools your team already uses. Conflict rules and failure alerts are part of the design.
How do you handle failed syncs?
Retries, monitoring, and clear failure paths are part of the design so silent breakage is easier to catch and fix. Dead-letter queues and replay strategies are used when volume warrants them.
Do you build internal APIs between services?
Yes. Clear contracts between services keep integrations maintainable as the product grows. We document auth, versioning, and error shapes for consumers.
Can you replace or refactor brittle integrations?
Yes. We audit existing connectors, prioritize the noisiest failures, and migrate incrementally where possible so you are not stuck on a big-bang cutover.
Ready to talk through scope?
Book a free consultation or get a directional project estimate.