Available authentication method - API key.
You need to provide X-API-KEY header with every request.
Curl example:
curl --request GET \
--url 'https://api.omnisend.com/v5/products' \
--header 'X-API-KEY: AjWvksZpTG4JZBdc4'
To get your API key go to API keys section
OAuth
We also support OAuth. Please refer to OAuth page