errorKeys
Set error keys on the most recently added webhook. If any of these keys appear in that webhook’s response, the response is treated as an error. Call it after each webhook whose errors you want to detect.
With no webhook added yet, the keys go on the data_map object itself, like
globalErrorKeys(), where SignalWire doesn’t read them.
Parameters
keys
List of JSON keys whose presence indicates an error.
Returns
DataMap — Self for method chaining.