The basic shape of all resource requests, sliced into various common actions against resources.
@spec from_payload( {:ok, [map()] | map() | nil, EPTSDK.t()} | {:error, any()} | {:error | :unprocessable_content | :decoding_error, any(), Req.Response.t()} ) :: {:ok, [struct()] | struct(), list(), EPTSDK.t()}