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Build property software that connects directly with Quardlyn.

Synchronise properties through the production CRM API, manage listings, upload media, track lifecycle changes and test outbound webhook simulations in sandbox. Available in minutes.

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Latest API Version
v1.0
API Status
Operational
Supported
Property CRM integrations
Changelog
CRM API v1 public baseline

Certification Guide

Go-live process
SandboxCreate an application and run API Explorer smoke tests.
ValidationRun simulator modes: simple, full, missing, invalid and edge.
Webhook SimulationsReview sandbox-only simulated events and replay rows; production outbound delivery is unavailable.
ApprovalProvide API logs, sample payloads and go-live checklist to support.
Required TestsCreate, update, price change, media update, withdraw, archive, restore, delete, duplicate idempotency and retryable failure.
Go Live ChecklistProduction API key, API/HMAC signing secret, production base URL https://api.quardlyn.co.uk/api/v1/crm, required fields external_ref, department and display_address, unique external_ref per CRM connection, public media URLs, rate-limit/backoff handling, lifecycle/status mapping, structured error logging and CRM-side idempotent retries.
Production ApprovalProduction access is requested from the Developer Console after sandbox certification. Support reviews payload coverage and lifecycle behaviour before production traffic is enabled.