SignatureDoesNotMatch about apai-io

[CydeSwype]

I get the same error. Trying to follow one of the examples in the repo and i get the following:

Fatal error: Uncaught GuzzleHttp\Exception\ClientException: Client error: `GET http://webservices.amazon.com/onca/xml?AWSAccessKeyId=**redacted**&AssociateTag=yawmp-20&BrowseNodeId=542064&Operation=BrowseNodeLookup&Service=AWSECommerceService&Timestamp=2017-11-06T22%3A09%3A32Z&Version=2013-08-01&Signature=**redacted**%3D` resulted in a `403 Forbidden` response: <?xml version="1.0"?> <BrowseNodeLookupErrorResponse xmlns="http://ecs.amazonaws.com/doc/2013-08-01/"><Error><Code>Signa (truncated...) in /Users/MacOSX/projects/wildfire/backoffice-poc/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113 Stack trace: #0 /Users/MacOSX/projects/wildfire/backoffice-poc/vendor/guzzlehttp/guzzle/src/Middleware.php(65): GuzzleHttp\Exception\RequestException::create(Object(GuzzleHttp\Psr7\Request), Object(GuzzleHttp\Psr7\Response)) #1 /Users/MacOSX/projects/wildfire/backoffice-poc/vendor/guzzlehttp/promises/src/Promise.php(203): GuzzleHttp\Middleware::GuzzleHttp\{closure}(Object(GuzzleHt in /Users/MacOSX/projects/wildfire/backoffice-poc/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php on line 113

[CydeSwype]

I resolved my issue by looking here: https://affiliate-program.amazon.com/assoc_credentials/home and creating a new set of credentials. I think I may have been using different API credentials for this (general API credentials instead of specific affiliate API credentials).