Get API credentials from DATEV β usually an API key or OAuth client from your account or your IT team.
In Retell, open your agent and go to Functions β Add custom function.
Enter the endpoint URL and method, and add your credentials as headers.
Define the parameters the agent should collect from the caller and pass through.
Write the description that tells the agent when to call the function β this is what the model uses to decide.
Test it in the LLM playground, check the response parses, then publish.
Client calls about a document deadline β agent checks status via your DATEV interface β confirms and logs the call
DATEV access is governed by your practice's own interface and data-protection setup.











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