API usage is limited to 2000 calls per hour and requires an API user. To create one, log into your account and go to the Access area. These APIs use UTC dates and times.
We recommend using version 2.0 of the API as it contains the most recent functionality. However, if you need to use the older version, the SOAP-only API v1.0 is still available.
API version 1 (SOAP only).