To access the API of a client webshop there must be an API key. This key can be created in the backoffice of the webshop, configuration, API. You can create more API keys with different levels of access.
At this moment there are 2 versions, API V2 and API V1. Please connect to V2 if possible, if not you can connect to V1. V2 only works with JSON. V1 with JSON ans XML.
If you have questions please contact our development by firstname.lastname@example.org.