HelloLedger for developers
Connect your app to real books
Sync customers, invoices, and payments from your billing, rent, or booking system into HelloLedger with a REST API. Your clients' bookkeepers see every charge and payment the same day.
curl -X PUT "https://api.helloledger.ai/v1/companies/{company_id}/invoices/by-external-id/chg_1042" \
-H "Authorization: Bearer $HL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"customer_external_id": "stu_1001",
"date": "2026-10-01",
"lines": [{ "item_id": "{rent_item_id}", "amount": "850.00" }]
}'What you can build
Customers
One customer per resident, student, or member, kept in sync by your own ID.
Invoices
Every charge becomes its own invoice, posted to the ledger at once. HelloLedger never emails your customers.
Payments
Each payment recorded on its own and applied to the exact invoices it paid.
Journals and reports
Post daily revenue journals, and read the chart of accounts, P&L, trial balance, and A/R aging.
Safe to retry
Every write is a PUT by your own external ID. Send it twice and you still get one record.
Scoped keys
Each key is limited to the companies and permissions you choose, and can be rotated or revoked anytime.
Clear errors
Every error has a stable code, a hint about what to fix, and a request ID for support.
Start here
Quickstart
Your first customer, invoice, and payment in a few minutes.
Rent and property management
Residents, every charge, and every payment, step by step.
Connect HelloLedger
Serving many businesses? Let each user connect their company from your app.
API reference
Every route and schema, generated from the OpenAPI contract.
Building something on HelloLedger?
If you're building an integration, a vertical app, or a platform for your customers' books, talk to us about your use case.