Andreas Dallner 
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Has successfully completed the Advanced CertificationHi Christoph,
if your key is the only secret or auth method, than I would suggest to configure a token login methon in advanced mode -> Here you can set the source to “Provided source” and your API key as token and with the Target “Header Parameter” the required header parameter name.
This login method can now be configured on each endpoint. When using different API keys for each endpoint just create a login method for each API key.
If you require more than one secret (e.g. client-secret and password) or if the API key has to be part of body or query parameters, we suggest to create a Simplifier User as API User, add the secrets as user attributes. Than you need to fetch the data from the API User’s attributes and set them as payload for the connector within a serverside business object.
Kind regards,
Andreas