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Parses a JSON response from the SEP-8 approval server into the appropriate Sep08PostTransactionResponse variant.
The JSON must contain a status field with one of the recognized values: "success", "revised", "pending", "action_required", or "rejected". Required fields are validated based on the status type.
Return
The parsed response as the appropriate sealed class variant
Parameters
json
The JSON object returned by the approval server
Throws
if the status field is missing or unrecognized, or if required fields for the given status are missing