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Parses a JSON response from a SEP-8 action URL into the appropriate Sep08PostActionResponse variant.
The JSON must contain a result field with one of the recognized values: "no_further_action_required" or "follow_next_url". Required fields are validated based on the result type.
Return
The parsed response as the appropriate sealed class variant
Parameters
json
The JSON object returned by the action URL
Throws
if the result field is missing or unrecognized, or if required fields for the given result are missing