Error calling PA-API 5.0!
HTTP Status Code: 400
Error Message: [400] Client error: `POST https://webservices.amazon.com/paapi5/searchitems` resulted in a `400 Bad Request` response:
{"__type":"com.amazon.paapi5#IncompleteSignatureException","Errors":[{"Code":"IncompleteSignature","Message":"The reques (truncated...)

Error Type: IncompleteSignature
Error Message: The request signature did not include all of the required components. If you are using an AWS SDK, requests are signed for you automatically; otherwise, go to https://webservices.amazon.com/paapi5/documentation/sending-request.html#signing.