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Authentication
To authenticate your application with the BuchhaltungsButler API, you need an <Api Client> and an <Api Secret>.
These should be kept confidential and not be handed over to any third parties.
Authentication is done by HTTP Basic Auth as specified by RFC 2617. This is to be implemented so that it produces the 'Authorization' request
header, containing the following value: '<Api Client>:<Api Secret>'.
Customer Selection
In order to use the API methods you need to specify the BB customer account you want to manage. This is done by providing the form field 'api_key' which contains
the target customers api key, which can be found in customers company data settings if customer has registered to api access.
API limits
It is only allowed to make a maximum of 100 requests per customer per minute to the API.