Plan: Access on all plans; rate limits scale by plan.
PayBlah exposes a REST API so your stack can read debtors and invoices, record payments, and inspect the message log within the scopes on your key.
Rate limits
- Each key is limited to a fixed number of requests per hour for your plan (the Settings foot note shows the current number when you issue keys).
- Every response carries
X-RateLimit-Remaining. - Over the limit: 429 with guidance on when to retry. Back off; do not spin.
Design habits that work
- Prefer webhooks for "something happened" instead of polling every minute.
- Use read-only scopes for reporting tools.
- Idempotency: treat webhook event ids and your own write keys carefully so retries do not double-post payments.
What the API will not do
It will not bypass safety rails (see API safety). Acceptable use still applies — the API is not a bulk-spam door.