Developer Guide: How to Integrate with MYOB API After March 2025 Overhaul
MYOB is the dominant accounting software platform for small and medium businesses in Australia and New Zealand, making API integration a common requirement for SaaS products targeting the ANZ market. The MYOB Business API is a REST-based JSON service supporting OAuth 2.0, covering core accounting functions such as invoices, contacts, payroll, and general ledger entries for both desktop and cloud-hosted files. In March 2025, MYOB overhauled its OAuth authentication flow, requiring all new integrations to use updated scopes and credentials, while keys issued before that date continue on the old system. Developers must register through the MYOB Developer Program at developer.myob.com to obtain a client ID and secret, with strict redirect URI matching enforced during authentication. Default API rate limits are set at 8 requests per second and one million requests per day, with a cap of two active API keys per developer account at any given time.
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