When using API Key authentication for HTTP(S) calls in SAP Integration Suite:
The API Key is typically included in the HTTP header (e.g., APIKey: or x-api-key: ).
Message headers are configured in the Content Modifier for outbound requests.
Other options:
Attachment → Used for file handling, not authentication.
Message body → Contains payload, not credentials.
Exchange property → Used internally within the flow, not sent externally.
Thus, the API Key must be placed in the Message header.
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