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Developers

Build on Letfold

One REST API and signed webhooks for everything a letting agency runs in Letfold: properties and photos, leads, viewings, tenancies and rent, repairs, certificates, documents and tasks. Realistic sandbox data, keys an agency issues itself, docs that are generated from the code.

What you can build

Website lead capture

POST a lead from any website form or chatbot. It lands in the agency's pipeline, is assigned round-robin and the team is alerted, exactly as if it had come in by phone.

Portal and marketing sync

Read every marketed property with photos, rent, EPC and features. Subscribe to property.updated and marketing_status.changed to keep listings in step.

Repairs and contractors

Raise repair tickets, post notes, move status. Webhooks tell your field-service app when a job is assigned or completed.

Finance and reporting

Tenancies, rent schedules, payments and arrears as integer minor units with the decimal alongside. Read-only by design.

Compliance

List certificates, add new ones, and be told 30 days before a gas safety record or EICR expires.

Automation

Zapier, Make and n8n work with any REST API plus webhooks: a new lead becomes a Slack message, a completed repair closes a ticket.

Three ways to integrate

WhoHowKeys
An agency's own developerThe agency owner or manager creates a key under Settings → API & webhooks, picks the scopes, and you call the API for that agency.lf_live_… issued by the agency
A partner productRequest access. We approve you into the sandbox, you build against realistic data, then go live; each agency that uses your product issues your app a key.lf_test_… from us, then lf_live_… from each agency
No-code automationZapier, Make, n8n or Power Automate with a key and a webhook endpoint. No partner approval needed.lf_live_… issued by the agency

Not building on the API but want your product listed, a portal feed, or a referral arrangement? Use Partner with Letfold.

Start here

  1. Quickstart: get a key, call GET /me, create a lead, receive a webhook. curl, PHP, Node and Python.
  2. Authentication & scopes: Bearer keys, scopes per resource, personal data masking.
  3. Conventions: versioning, cursor pagination, RFC 9457 errors, idempotency, ETags, rate limits.
  4. Webhooks: the event catalogue, Standard Webhooks signatures, the retry schedule.
  5. API reference: the OpenAPI 3.1 document, rendered. Also at /api/v1/openapi.json.
Base URL https://app.letfold.com/api/v1. Support: [email protected]. Changes are announced on the changelog and emailed to the developer address on each key.