Pleo is introducing a number of changes to our public API, which mean support for the API marked as "Legacy" is only for existing developers. We are no longer onboarding new customers to this API.
New APIs are being developed and documentation will be publicly available in the coming months.
The Pleo Accounting API is organized around REST. Our API has predictable resource-oriented URLs, accepts form-encoded request bodies, returns JSON-encoded responses, and uses standard HTTP response codes, authentication, and verbs.