API & integrations — Syntorium

Integrations rot faster than anything else in software, so we build them like ops projects, not like product features. Every webhook is idempotent, every external call has a timeout and a retry budget, and every flow has a runbook. We’ve shipped against Salesforce, Marketo, WhatsApp Cloud API, MetaTrader 5, Booking.com, and a dozen ERPs you’ve never heard of.

Stack & defaults

Framework

Laravel / NestJS / Hono

Protocol

GraphQL / tRPC / REST

Storage

PostgreSQL + Redis

Payments

Stripe / Adyen

Identity

Auth0 / Clerk

Messaging

WhatsApp Cloud / Twilio

CRM

Salesforce / HubSpot

ERP

SAP / NetSuite

What you receive

OpenAPI / GraphQL schema

Typed end-to-end. Clients in your language of choice generated from the schema.

Webhook reliability

Retries, idempotency keys, dead-letter queue, replay tooling. Standard kit.

Identity & payment flows

Stripe Connect, Adyen marketplace, subscriptions, KYC — we've shipped all of it.

ERP / CRM bridges

Bidirectional sync, conflict resolution, audit trail. We've done Salesforce, Marketo, SAP.

Rate limiting + abuse protection

Per-user, per-IP, per-key. Redis-backed. Tested under load.

Runbook + on-call

Plain-English runbook for the integration. We can stay on as on-call.

Timeline

Wk 1

Discovery

Read existing schemas, document the contract, agree the shape.

Wk 2–4

Build

Endpoints, webhooks, retry logic, observability.

Wk 5–6

Hardening

Load tests, abuse tests, idempotency proofs.

Wk 7–8

Cutover

Phased rollout, dashboards, on-call handoff.

FAQ

Can you integrate with our internal/legacy system?

Almost certainly yes. We've shipped against SAP, NetSuite, custom mainframes, and undocumented vendor APIs. The harder the documentation, the more we charge.

Do you handle PCI / KYC compliance?

We architect for it: tokenization, scope-minimal data flows, audit trails. We're not a QSA, so the formal audit is on you — but the system is built to pass.

What about webhook reliability?

Idempotency keys, exponential retries, dead-letter queue, manual replay tool. This is the standard kit, not a premium add-on.

Do you ship SDKs?

If your API has external consumers, yes — generated from your OpenAPI/GraphQL schema in the languages your customers use.