Omnisend Developer center provides you information on how to easily integrate Omnisend with your store, application or any other online service.
To find out how our API works, start with Quick start docs.

Before you begin

What is needed to start using API - registration, API keys, authentification
Using API

Short information about API endpoints, how calls are made, status codes, filters, sorting, pagination, http methods
Rate limiting

Information about rate limits, how to view them, etc.