[401] [401] Client error: `POST https://webservices.amazon.co.jp/paapi5/getitems` resulted in a `401 Unauthorized` response: {"__type":"com.amazon.paapi5#UnrecognizedClientException","Errors":[{"Code":"UnrecognizedClient","Message":"The Access K (truncated...)

[401] [401] Client error: `POST https://webservices.amazon.co.jp/paapi5/getitems` resulted in a `401 Unauthorized` response: {"__type":"com.amazon.paapi5#UnrecognizedClientException","Errors":[{"Code":"UnrecognizedClient","Message":"The Access K (truncated...)

[401] [401] Client error: `POST https://webservices.amazon.co.jp/paapi5/getitems` resulted in a `401 Unauthorized` response: {"__type":"com.amazon.paapi5#UnrecognizedClientException","Errors":[{"Code":"UnrecognizedClient","Message":"The Access K (truncated...)

[401] [401] Client error: `POST https://webservices.amazon.co.jp/paapi5/getitems` resulted in a `401 Unauthorized` response: {"__type":"com.amazon.paapi5#UnrecognizedClientException","Errors":[{"Code":"UnrecognizedClient","Message":"The Access K (truncated...)

[401] [401] Client error: `POST https://webservices.amazon.co.jp/paapi5/getitems` resulted in a `401 Unauthorized` response: {"__type":"com.amazon.paapi5#UnrecognizedClientException","Errors":[{"Code":"UnrecognizedClient","Message":"The Access K (truncated...)

南博さんの本は、立ち読みだけで読了。
方法論が同じで買うまでには至らない。
すみません。