Getting started

Authentication schemes

Choose between API key and OAuth 2.0 authentication for the Brevo API
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API Key

Use a secret token for direct API access.

When to use?
Direct integrations and server-to-server communication where you control both endpoints.

OAuth 2.0

Let users in your organisation authorize your app to act on their behalf.

When to use?
Private integrations within your organisation — set up in minutes with the Brevo CLI.

API key authentication

Use API key authentication for direct API access. Include your API key in the api-key header for each request.

Best for:

  • Direct API integrations
  • Server-to-server communication
  • Testing and development

See API Key authentication for setup instructions.

OAuth 2.0 authentication

Use OAuth 2.0 when your application needs to act on behalf of a Brevo user. Create and manage OAuth apps instantly with the Brevo CLI — no form, no manual approval.

Best for:

  • Apps acting on behalf of a user
  • Private integrations within an organisation
  • Delegated access with user consent

See OAuth 2.0 to get started.