External API means you set up external software (such as legacy systems, reporting engines, etc.) that initiates calls to the Odoo API (JSON-RPC or XML-RPC) to query, retrieve or update data stored in Odoo. When the call is initiated from Odoo, this is NOT considered an “External API.” For example, when an Odoo app uses an external service such as payment providers (Stripe, PayPal, Adyen, etc.), delivery carriers (UPS, FedEx, DHL, etc.), VoIP providers, or bank synchronization, it is part of the standard plan.
