I came up with the idea to test generating leads with Twitter Cards. I set up the card and provided the end point of the provider API (it is not on the list of currently supported service providers). As twitter also supports mapping parameter names, this was quite easy. Then I came to the point that the API requires an API key being provided in a custom header field.
Can I set up the card to send this API key as a header field?
If not, how can I authenticate with an API? I somehow do not want to add an unauthenticated API.
Thank you for your support,